xref: /src/share/mk/bsd.README

#	$NetBSD: bsd.README,v 1.371 2018/05/09 22:24:01 joerg Exp $
#	@(#)bsd.README	8.2 (Berkeley) 4/2/94

This is the README file for the make "include" files for the NetBSD
source tree.  The files are installed in /usr/share/mk, and are,
by convention, named with the suffix ".mk".

Note, this file is not intended to replace reading through the .mk
files for anything tricky.

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

RANDOM THINGS WORTH KNOWING:

The files are simply C-style #include files, and pretty much behave like
you'd expect.  The syntax is slightly different in that a single '.' is
used instead of the hash mark, i.e. ".include <bsd.prog.mk>".

One difference that will save you lots of debugging time is that inclusion
of the file is normally done at the *end* of the Makefile.  The reason for
this is because .mk files often modify variables and behavior based on the
values of variables set in the Makefile.  To make this work, remember that
the FIRST target found is the target that is used, i.e. if the Makefile has:

	a:
		echo a
	a:
		echo a number two

the command "make a" will echo "a".  To make things confusing, the SECOND
variable assignment is the overriding one, i.e. if the Makefile has:

	a=	foo
	a=	bar

	b:
		echo ${a}

the command "make b" will echo "bar".  This is for compatibility with the
way the V7 make behaved.

It's fairly difficult to make the BSD .mk files work when you're building
multiple programs in a single directory.  It's a lot easier to split up the
programs than to deal with the problem.  Most of the agony comes from making
the "obj" directory stuff work right, not because we switched to a new version
of make.  So, don't get mad at us, figure out a better way to handle multiple
architectures so we can quit using the symbolic link stuff.  (Imake doesn't
count.)

The file .depend in the source directory is expected to contain dependencies
for the source files.  This file is read automatically by make after reading
the Makefile.

The variable DESTDIR works as before.  It's not set anywhere but will change
the tree where the file gets installed.

The profiled libraries are no longer built in a different directory than
the regular libraries.  A new suffix, ".po", is used to denote a profiled
object, and ".pico" denotes a shared (position-independent) object.

There are various make variables used during the build.

Many variables support a (case sensitive) value of "no" or "yes",
and are tested with  ${VAR} == "no"  and  ${VAR} != "no" .


The basic rule for the variable naming scheme is as follows:

HOST_xxx	A command that runs on the host machine regardless of
		whether or not the system is being cross compiled, or
		flags for such a command.

MKxxx		Can be set to "no" to disable functionality, or
		"yes" to enable it.
		Usually defaults to "yes", although some variables
		default to "no".
		Due to make(1) implementation issues, if a temporary
		command-line override of a mk.conf(5) or <bsd.own.mk>
		setting is required whilst still honoring a particular
		Makefile's setting of MKxxx, use
			env MKxxx=value make
		instead of
			make MKxxx=value

NOxxx		If defined, disables a feature.
		Not intended for users.
		This is to allow Makefiles to disable functionality
		that they don't support (such as missing man pages).
		NOxxx variables must be defined before <bsd.own.mk>
		is included.

TOOL_xxx	A tool that is provided as part of the USETOOLS
		framework.  When not using the USETOOLS framework,
		TOOL_xxx variables should refer to tools that are
		already installed on the host system.

The following variables that control how things are made/installed that
are not set by default. These should not be set by Makefiles; they're for
the user to define in MAKECONF (see <bsd.own.mk>, below, or mk.conf(5))
or on the make(1) command line:

BUILD 		If defined, 'make install' checks that the targets in the
		source directories are up-to-date and remakes them if they
                are out of date, instead of blindly trying to install
                out of date or non-existent targets.

MAKEVERBOSE	Control how "verbose" the standard make(1) rules are.
		Default: 2
		Supported values:
		    0	Minimal output ("quiet")
		    1	Describe what is occurring
		    2	Describe what is occurring and echo the actual command
		    3	Ignore the effect of the "@" prefix in make commands
		    4	Trace shell commands using the shell's -x flag

MKATF		If "no", don't build the Automated Testing Framework (ATF),
		which includes the libatf-c, libatf-c++ and libatf-sh libraries
		and the various command line tools.  Also, because the build of
		the libraries is disabled, don't build the NetBSD test suite
		either.
		Default: yes

MKBFD		Obsolete, use MKBINUTILS

MKBINUTILS	If "no", don't build binutils (gas, ld, etc and libbfd,
		libopcodes)
		Default: yes

MKBSDTAR	If "yes", use the libarchive based cpio and tar instead of
		the pax frontends.
		Default: no

MKCATPAGES	If "no", don't build or install the catman pages.
		Default: no

MKCOMPAT  	If "no", don't build or install the src/compat.
		Default: yes on amd64/mips64/sparc64, no elsewhere.

MKCOMPATTESTS  	If "yes", build and install the NetBSD test suite when
		building and installing src/compat.
		Default: no

MKCOMPATX11  	If "yes", build and install the X11 libraries when
		building and installing src/compat.
		Default: no

MKCOMPLEX	If "no", don't build libm support for <complex.h>
		Default: yes

MKCTF		If "no", do not build and install CTF tools, and also
		don't generate and manipulate CTF data of ELF binaries
		during build.
		Default: no

NOCTF		Don't generate and manipulate CTF data of ELF binaries
		during build. It is set internally for standalone programs.

MKCVS		If "no", don't build or install cvs(1).
		Default: yes

MKDEBUG		If "no", don't build and install separate debugging symbols
		into /usr/libdata/debug.
		Default: no

NODEBUG		Don't compile with debugging symbols during build.
		It is set internally for standalone programs.

MKDEBUGLIB	Build *_g.a debugging libraries, which are compiled
		with -DDEBUG.
		Default: no

MKDEPINCLUDES	If "yes" issue .include statements in the .depend file
		instead of inlining the contents of the .d files. Useful
		when stale dependencies are present, to list the exact
		files that need refreshing. It is off by default because
		it is possibly slower.
		Default "no"

MKDOC		If "no", don't build or install the documentation.
		Default: yes

MKDTRACE	If "no", do not build and install the kernel modules,
		utilities and libraries used to implement the dtrace(1)
		facility.
		Default: no

MKDYNAMICROOT	If "no", build programs in /bin and /sbin statically,
		don't install certain libraries in /lib, and don't
		install the shared linker into /libexec.
		Default: yes

MKEXTSRC        If not "no", 'make build' also descends into either src/extsrc
		to cross-build programs and libraries externally added by
		users, and automatically enables creation of those sets.
		Default: no

MKGCC		If "no", don't build gcc(1) or any of the GCC-related
		libraries (libgcc, libobjc, libstdc++).
		Default: yes

MKGCCCMDS	If "no", don't build gcc(1), but do build the GCC-related
		libraries (libgcc, libobjc, libstdc++).
		Default: yes

MKGDB		If "no", don't build gdb(1).
		Default: yes

MKGROFFHTMLDOC	If "no", avoid trying to use groff to generate html for
		miscellaneous articles, as this seems to sometimes want
		to run software not in base. Does not affect html man
		pages.
		Default: no

MKHESIOD	If "no", disables building of Hesiod infrastructure
		(libraries and support programs).
		Default: yes

MKHOSTOBJ	If not "no", for programs intended to be run on the compile
		host, the name, release, and architecture of the host
		operating system will be suffixed to the name of the object
		directory created by "make obj".
		Default: no

MKHTML		If "no", don't build or install the HTML man pages.
		Default: yes

MKIEEEFP	If "no", don't add code for IEEE754/IEC60559 conformance.
		Has no effect on most platforms.
		Default: yes

MKSTRIPIDENT	Strip the RCS IDs from program binaries and shared libraries.
		Default: no

MKINET6		If "no", disables building of INET6 (IPv6) infrastructure
		(libraries and support programs).  This option must not be
		set to "no" if MKX11 is not "no".
		Default: yes

MKINFO		If "no", don't build or install Info documentation from
		Texinfo source files.
		Default: yes

MKIPFILTER	If "no", don't build or install the IP Filter programs and LKM.
		Default: yes

MKISCSI		If "no", don't build or install iSCSI library or applications
		(depends on libpthread.)
		Default: yes

MKKDEBUG	If "yes", force building of kernel symbol info and creation
		of netbsd.gdb in all kernel builds, independently of the
		settings for "makeoptions DEBUG" in the kernel config file.

MKKERBEROS	If "no", disables building of Kerberos v5
		infrastructure (libraries and support programs).
		Default: yes

MKKMOD		If "no", disables building of kernel modules.
		Default: yes

MKKYUA		If "no", don't build Kyua nor its dependent library Lutok.
		Note that setting this to "no" does not disable the build of
		the NetBSD test suite itself; the build of the tests is
		controlled by the MKATF knob.
		Default: no (until the import is done and validated)

MKLDAP		If "no", disables building of LDAP infrastructure
		(libraries and support programs).
		Default: yes

MKLIBCXX	If not "no", build and install libc++.
		Default: no

MKLIBSTDCXX	If not "no", build and install libstdc++.
		Default: yes

MKLINKLIB	If "no", act as "MKLINT=no MKPICINSTALL=no MKPROFILE=no".
		Also:
			- don't install the .a libraries
			- don't install _pic.a libraries on PIC systems
			- don't build .a libraries on PIC systems
			- don't install the .so symlink on ELF systems
		I.e, only install the shared library (and the .so.major
		symlink on ELF).
		Default: yes

MKLINT		If "no", don't build or install the lint libraries.
		Default: yes

MKLVM		If "no", don't build or install the logical volume manager
		and device mapper tools and libraries
		Default: yes

MKMAN		If "no", don't build or install the man or catman pages,
		and also acts as "MKCATPAGES=no MKHTML=no".
		Default: yes

MKMANDOC	If "yes", mandoc is built as tool and used to compile
		catman or html pages.  A directory can be exempted by
		defining NOMANDOC.  Individual man pages are exempted
		if NOMANDOC.${target} is set to "yes".
		Default: yes

MKMANZ		If not "no", compress manual pages at installation time.
		Default: no

MKMDNS		If "no", disables building of mDNS infrastructure
		(libraries and support programs).
		Default: yes

MKNLS		If "no", don't build or install the NLS files and locale
		definition files.
		Default: yes

MKNPF		If "no", don't build or install the NPF and its modules.
		Default: yes

MKNSD		If "no", don't build or install the "nsd" DNS authoritative
		server.
		Default: no

MKOBJ		If "no", don't enable the rule which creates objdirs,
		and also acts as "MKOBJDIRS=no".
		Default: yes

MKOBJDIRS	If "no", don't create objdirs during a "make build".
		Default: no

MKPAM		If "no", disables building of PAM authentication
		infrastructure (libraries and support programs).
		Default: yes

MKPCC		If "no", don't build pcc(1) or any of the PCC-related
		libraries (libpcc, libpccsoftfloat).
		Default: no

MKPF		If "no", don't build or install the pf programs and LKM.
		Default: yes

MKPIC		If "no", don't build or install shared libraries, and
		also acts as "MKPICLIB=no"
		Default: yes (for MACHINE_ARCHs that support it)

MKPICINSTALL	If "no", don't install the *_pic.a libraries.
		Default: yes

MKPICLIB	If "no", don't build *_pic.a libraries, and build the
		shared object libraries from the .a libraries.
		A symlink is installed in ${DESTDIR}/usr/lib for the
		_pic.a library pointing to the .a library.
		Default: yes

MKPIE		If "no", create regular executables. Otherwise create
		PIE (Position Independent Executables).
		Default: no

NOPIE		Don't create PIE (Position Independent Executables)
		It is set internally for standalone programs.

MKPIGZGZIP	If "no", only install pigz as pigz, not gzip.
		Default: no

MKPOSTFIX	If "no", don't build or install postfix(1).
		Default: yes

MKPROFILE	If "no", don't build or install the profiling (*_p.a) libraries.
		Default: yes

MKRADEONFIRMWARE If "no", install the /libdata/firmware/radeon directory,
		which is necessary for the radeon DRM driver.
		Default: yes on i386 and amd64, no elsewhere.

MKRELRO		If "partial", set the non-PLT GOT to read-only. If "full"
		also force immediate symbol binding.
		Default: no
	
MKREPRO         If "yes", create reproducible builds. This enables
		different switches to make two builds from the same source tree
		result in the same build results.
		Default: no

MKSHARE		If "no", act as "MKCATPAGES=no MKDOC=no MKHTML=no MKINFO=no
		MKMAN=no MKNLS=no".
		I.e, don't build catman pages, documentation, Info
		documentation, man pages, NLS files, ...
		Default: yes

MKSKEY		If "no", disables building of S/key authentication
		infrastructure (libraries and support programs).
		Default: yes

MKSLJIT		If "no", disables building of sljit (stack-less platform
		independent JIT compiler) private library and tests.
		Default: yes on amd64, i386 and sparc, no elsewhere.

MKSOFTFLOAT	If not "no", build with options to enable the compiler to
		generate output containing library calls for floating
		point and possibly soft-float library support.
		Default: no

MKSTATICLIB	If "no", don't build or install the normal static (*.a)
		libraries.
		Default: yes

MKSTATICPIE	Compile in support for static pie binaries. These binaries
		use a special rcrt0.o/mcrt0.o that do the necessary relocations
		Default: yes on platforms that support it.

MKSTRIPSYM	If "yes", strip all local symbols from shared libraries;
		the affect is equivalent to -x option of ld(1). If "no",
		strip only temporary local symbols; the affect is equivalent
		to -X option of ld(1). Keeping non-temporary local symbols
		such as static function names is useful on using DTrace for
		userland libraries and getting a backtrace from a rump kernel
		loading shared libraries.
		Default: yes

MKTEGRAFIRMWARE	If "no", install the /libdata/firmware/nvidia directory,
		which is necessary for the NVIDIA Tegra XHCI driver.
		Default: yes on evbarm, no elsewhere.

MKTOOLSDEBUG	If "yes" build the tools with debugging symbols.
		Default: no

MKTPM		If "no" then don't build the Trusted Platform Module
		infrastructure.
		Default: no

MKUNBOUND	If not "no", build and install the "unbound" DNS resolver.
		Default: yes

MKUNPRIVED	If not "no", don't set the owner/group/mode when installing
		files or directories, and keep a metadata log of what
		the owner/group/mode should be.  This allows a
		non-root "make install".
		Default: no

MKUPDATE 	If not "no", 'make install' only installs targets that are
		more recently modified in the source directories that their
		installed counterparts.
		Default: no

MKX11		If not "no", 'make build' also descends into 
		src/external/mit/xorg to cross-build X11 and automatically
		enables creation of X sets.
		Default: no

MKX11FONTS	If not "no", do not build or install the X fonts.  The xfont
		set is still created but will be empty.
		Default: yes

MKX11MOTIF:	If "yes", build the native X11 libGLw with Motif stubs.  If
		Motif is not installed in the default location /usr/pkg, the
		location can be specified using the X11MOTIFPATH variable.
		Default: no

MKYP		If "no", disables building of YP (NIS)
		infrastructure (libraries and support programs).
		Default: yes

MKZFS		If "no", do not build and install utilities and libraries
		used to manage ZFS file system. Do not build zfs and solaris
		compatibility kernel modules.  Note: ZFS requires 64bit
		atomic operations.
		Default: yes on amd64, no elsewhere.

MKRUMP		If "no", do not build and install rump related headers,
		libraries, and programs.
		Default: yes

USE_HESIOD	If "no", disables building Hesiod support into
		various system utilities/libraries that support it.
		If ${MKHESIOD} is "no", USE_HESIOD will also be
		forced to "no".

USE_INET6	If "no", disables building INET6 (IPv6) support into
		various system utilities/libraries that support it.
		If ${MKINET6} is "no", USE_INET6 will also be
		forced to "no".

USE_JEMALLOC	If "no", disables building the "jemalloc" allocator
		designed for improved performance with threaded
		applications.  The "phkmalloc" allocator as used up
		before NetBSD-5.0 will be substituted.

USE_KERBEROS	If "no", disables building Kerberos v5
		support into various system utilities/libraries that
		support it.  If ${MKKERBEROS} is "no", USE_KERBEROS
		will also be forced to "no".

USE_LDAP	If "no", disables building LDAP support into various
		system utilities/libraries that support it.
		If ${MKLDAP} is "no", USE_LDAP will also be forced to "no".

USE_PAM		If "no", disables building PAM authentication support
		into various system utilities/libraries that support it.
		If ${MKPAM} is "no", USE_PAM will also be forced to "no".

USE_SKEY	If "no", disables building S/key authentication
		support into various system utilities/libraries that
		support it.  If ${MKSKEY} is "no", USE_SKEY will
		also be forced to "no".
		Default: no

USE_SSP		If "no", disables GCC stack protection code, which
		detects stack overflows and aborts the program. The
		stack protection code imposes a performance penalty
		of about 5%.
		Default: "no", unless "USE_FORT" is set to "yes"

NOSSP		Don't compile with stack protector during build.
		It is set internally for standalone programs.

USE_FORT 	If "yes" turns on substitute wrappers for commonly used
		functions that do not do bounds checking regularly, but
		they could in some cases by using the gcc
		__builtin_object_size() function to determine the buffer
		size where it is known and detect buffer overflows.
		These substitute functions are in /usr/include/ssp.
		Default: depends on the part of the source tree

NOFORT		Don't compile with substitute wrappers during build.
		It is set internally for standalone programs.

USE_YP		If "no", disables building YP (NIS) support into
		various system utilities/libraries that support it.
		If ${MKYP} is "no", USE_YP will also be forced to "no".

USE_PIGZGZIP	If "no", use the host "gzip" program to compress things.
		Otherwise, build tools/pigz, set TOOL_GZIP=${TOOL_PIGZ},
		and use nbpigz to compress things.
		Default: "no".

COPTS.lib<lib>
OBJCOPTS.lib<lib>
LDADD.lib<lib>
CPPFLAGS.lib<lib>
CXXFLAGS.lib<lib>
COPTS.<prog>
OBJCCOPTS.<prog>
LDADD.<prog>
CPPFLAGS.<prog>
CXXFLAGS.<prog>	These provide a way to specify additions to the associated
		variables in a way that applies only to a particular library
		or program.  <lib> corresponds to the LIB variable set in
		the library's makefile.  <prog> corresponds to either PROG
		or PROG_CXX (if set).  For example, if COPTS.libcrypto is
		set to "-g", "-g" will be added to COPTS only when compiling
		the crypto library.

The active compiler is selected using the following variables:
AVAILABLE_COMPILER
		List of available compiler suites.  Processed in order
		for selecting the active compiler for each frontend.
HAVE_PCC	If defined, PCC is present and enabled.
HAVE_LLVM	If defined, LLVM/Clang is present and enabled.
UNSUPPORTED_COMPILER.xxx
		If defined, the support for compiler "xxx" is disabled.

For the frontends (CC, CPP, CXX, FC and OBJC) the following variables exist:
ACTIVE_CC	Active compile suite for the CC frontend.
SUPPORTED_CC	Compile suite with support for the CC frontend.
TOOL_CC.xxx	Path to the CC frontend for compiler "xxx"

=-=-=-=-=   sys.mk   =-=-=-=-=

The include file <sys.mk> has the default rules for all makes, in the BSD
environment or otherwise.  You probably don't want to touch this file.

=-=-=-=-=   bsd.own.mk   =-=-=-=-=

The include file <bsd.own.mk> contains source tree configuration parameters,
such as the owners, groups, etc. for both manual pages and binaries, and
a few global "feature configuration" parameters.

It has no targets.

To get system-specific configuration parameters, <bsd.own.mk> will try to
include the file specified by the "MAKECONF" variable.  If MAKECONF is not
set, or no such file exists, the system make configuration file, /etc/mk.conf
is included.  These files may define any of the variables described below.

<bsd.own.mk> sets the following variables, if they are not already defined
(defaults are in brackets):

NETBSDSRCDIR	Top of the NetBSD source tree.
		If _SRC_TOP_ != "", that will be used as the default,
		otherwise BSDSRCDIR will be used as the default.
		Various makefiles within the NetBSD source tree will
		use this to reference the top level of the source tree.

_SRC_TOP_	Top of the system source tree, as determined by <bsd.own.mk>
		based on the presence of tools/ and build.sh.  This variable
		is "internal" to <bsd.own.mk>, although its value is only
		determined once and then propagated to all sub-makes.

_NETBSD_VERSION_DEPENDS
		A list of files which contain information about
		the version of the NetBSD being built.  This is
		defined only if the current directory appears
		to be inside a NetBSD source tree.  The list of
		files includes ${NETBSDSRCDIR}/sys/sys/param.h
		(which contains the kernel version number),
		${NETBSDSRCDIR}/sys/conf/newvers.sh and
		${NETBSDSRCDIR}/sys/conf/osrelease.sh (which
		interpret the information in sys/sys/param.h), and
		${_SRC_TOP_OBJ_}/params (which is an optional file,
		created by "make build" in ${_SRC_TOP_}/Makefile,
		containing all the variables that may influence the
		build).

		Targets that depend on the NetBSD version, or on
		variables defined at build time, can declare a
		dependency on ${_NETBSD_VERSION_DEPENDS}, like this:

			version.c: ${_NETBSD_VERSION_DEPENDS}
				commands to create version.c

BSDSRCDIR	The real path to the system sources, so that 'make obj'
		will work correctly.  [/usr/src]

BSDOBJDIR	The real path to the system 'obj' tree, so that 'make obj'
		will work correctly.  [/usr/obj]

BINGRP		Binary group.  [wheel]

BINOWN		Binary owner.  [root]

BINMODE		Binary mode.  [555]

NONBINMODE	Mode for non-executable files.  [444]

MANDIR		Base path for manual installation.  [/usr/share/man/cat]

MANGRP		Manual group.  [wheel]

MANOWN		Manual owner.  [root]

MANMODE		Manual mode.  [${NONBINMODE}]

MANINSTALL	Manual installation type.  Space separated list:
			catinstall, htmlinstall, maninstall
		Default value derived from MKCATPAGES and MKHTML.

LDSTATIC	Control program linking; if set blank, link everything
		dynamically.  If set to "-static", link everything statically.
		If not set, programs link according to their makefile.

LIBDIR		Base path for library installation.  [/usr/lib]

LINTLIBDIR	Base path for lint(1) library installation.  [/usr/libdata/lint]

LIBGRP		Library group.  [${BINGRP}]

LIBOWN		Library owner.  [${BINOWN}]

LIBMODE		Library mode.  [${NONBINMODE}]

DOCDIR		Base path for system documentation (e.g. PSD, USD, etc.)
	        installation.  [/usr/share/doc]

DOCGRP		Documentation group.  [wheel]

DOCOWN		Documentation owner.  [root]

DOCMODE		Documentation mode.  [${NONBINMODE}]

GZIP_N_FLAG	Flags to pass to TOOL_GZIP to prevent it from inserting
		file names or timestamps in the compressed output.
		[-n, or -nT when TOOL_GZIP is really TOOL_PIGZ]

NLSDIR		Base path for Native Language Support files installation.
		[/usr/share/nls]

NLSGRP		Native Language Support files group.  [wheel]

NLSOWN		Native Language Support files owner.  [root]

NLSMODE		Native Language Support files mode.  [${NONBINMODE}]

X11SRCDIR	The path to the xsrc tree.  [${NETBSDSRCDIR}/../xsrc,
		if that exists; otherwise /usr/xsrc]

X11SRCDIR.local	The path to the local X11 src tree.  [${X11SRCDIR}/local]

X11SRCDIR.lib<package>
X11SRCDIR.<package>
		The path to the xorg src tree for the specificed package>.
		[${X11SRCDIR}/external/mit/xorg/<package>/dist]

X11ROOTDIR	Root directory of the X11 installation.  [/usr/X11R7]

X11BINDIR	X11 bin directory.  [${X11ROOTDIR}/bin]

X11FONTDIR	X11 font directory.  [${X11ROOTDIR}/lib/X11/fonts]

X11INCDIR	X11 include directory.  [${X11ROOTDIR}/include]

X11LIBDIR	X11 lib/x11 (config) directory.  [${X11ROOTDIR}/lib/X11]

X11MANDIR	X11 manual directory.  [${X11ROOTDIR}/man]

X11USRLIBDIR	X11 library directory.  [${X11ROOTDIR}/lib]

STRIPFLAG	The flag passed to the install program to cause the binary
		to be stripped.  This is to be used when building your
		own install script so that the entire system can be made
		stripped/not-stripped using a single knob.  []

COPY		The flag passed to the install program to cause the binary
		to be copied rather than moved.  This is to be used when
		building our own install script so that the entire system
		can either be installed with copies, or with moves using
		a single knob.  [-c]

MAKEDIRTARGETENV
		Environment variables passed to the child make process
		invoked by MAKEDIRTARGET.

MAKEDIRTARGET dir target [params]
		Runs "cd $${dir} && ${MAKE} [params] $${target}",
		displaying a "pretty" message whilst doing so.

RELEASEMACHINEDIR
		Subdirectory used below RELEASEDIR when building
		a release.  [${MACHINE}]

RELEASEMACHINE	Subdirectory or path component used for the following
		paths:
			distrib/${RELEASEMACHINE}
			distrib/notes/${RELEASEMACHINE}
			etc/etc.${RELEASEMACHINE}
		Used when building a release.  [${MACHINE}]

Additionally, the following variables may be set by <bsd.own.mk> or in a
make configuration file to modify the behavior of the system build
process (default values are in brackets along with comments, if set by
<bsd.own.mk>):

USETOOLS	Indicates whether the tools specified by ${TOOLDIR} should
		be used as part of a build in progress.
		Supported values:

		yes	Use the tools from TOOLDIR.
			Must be set to this if cross-compiling.

		no	Do not use the tools from TOOLDIR, but refuse to
			build native compilation tool components that are
			version-specific for that tool.

		never	Do not use the tools from TOOLDIR, even when
			building native tool components.  This is similar to
			the traditional NetBSD build method, but does not
			verify that the compilation tools in use are
			up-to-date enough in order to build the tree
			successfully.  This may cause build or runtime
			problems when building the whole NetBSD source tree.

		Default: "yes" if building all or part of a whole NetBSD
		source tree (detected automatically); "no" otherwise
		(to preserve traditional semantics of the <bsd.*.mk>
		make(1) include files).

OBJECT_FMT	Object file format.  [set to "ELF" on architectures that
		use ELF -- currently all architectures].

TOOLCHAIN_MISSING
		If not "no", this indicates that the platform being built
		does not have a working in-tree toolchain.  If the
		${MACHINE_ARCH} in question falls into this category,
		TOOLCHAIN_MISSING is conditionally assigned the value "yes".
		Otherwise, the variable is unconditionally assigned the
		value "no".
		If not "no", ${MKBINUTILS}, ${MKGCC}, and ${MKGDB} are
		unconditionally assigned the value "no".

EXTERNAL_TOOLCHAIN
		This variable is not directly set by <bsd.own.mk>, but
		including <bsd.own.mk> is the canonical way to gain
		access to this variable.  The variable should be defined
		either in the user's environment or in the user's mk.conf
		file.  If defined, this variable indicates the root of
		an external toolchain which will be used to build the
		tree.  For example, if a platform is a ${TOOLCHAIN_MISSING}
		platform, EXTERNAL_TOOLCHAIN can be used to re-enable the
		cross-compile framework.

		If EXTERNAL_TOOLCHAIN is defined, ${MKGCC} is unconditionally
		assigned the value "no", since the external version of the
		compiler may not be able to build the library components of
		the in-tree compiler.

		This variable should be used in conjunction with an appropiate
		HAVE_GCC or HAVE_LLVM setting to control the compiler flags.

		NOTE: This variable is not yet used in as many places as
		it should be.  Expect the exact semantics of this variable
		to change in the short term as parts of the cross-compile
		framework continue to be cleaned up.

The following variables are defined to commands to perform the
appropriate operation, with the default in [brackets].  Note that
the defaults change if USETOOLS == "yes":

TOOL_AMIGAAOUT2BB	aout to Amiga bootblock converter.  [amiga-aout2bb]

TOOL_AMIGAELF2BB	ELF to Amiga bootblock converter.  [amiga-elf2bb]

TOOL_AMIGATXLT		Amige assembly language format translator.  [amiga-txlt]

TOOL_ASN1_COMPILE	ASN1 compiler.  [asn1_compile]

TOOL_AWK		Pattern-directed scanning/processing language.  [awk]

TOOL_CAP_MKDB		Create capability database.  [cap_mkdb]

TOOL_CAT		Concatenate and print files.  [cat]

TOOL_CKSUM		Display file checksums.  [cksum]

TOOL_COMPILE_ET		Error table compiler.  [compile_et]

TOOL_CONFIG		Build kernel compilation directories.  [config]

TOOL_CRUNCHGEN		Generate crunched binary build environment.  [crunchgen]

TOOL_CTAGS		Create a tags file.  [ctags]

TOOL_DB			Manipulate db(3) databases.  [db]

TOOL_DISKLABEL		Read and write disk pack label.  [disklabel]

TOOL_EQN		Format equations for groff.  [eqn]

TOOL_FDISK		MS-DOS partition maintenance program.  [fdisk]

TOOL_FGEN		IEEE 1275 Open Firmware FCode Tokenizer.  [fgen]

TOOL_GENASSYM		Generate constants for assembly files.  [genassym]

TOOL_GENCAT		Generate NLS message catalogs.  [gencat]

TOOL_GMAKE		GNU make utility.  [gmake]

TOOL_GREP		Print lines matching a pattern.  [grep]

TOOL_GROFF		Front end for groff document formatting system.  [groff]

TOOL_GZIP		Compression/decompression tool.  [gzip]

TOOL_GZIP_N		Same as TOOL_GZIP, plus a command line option to
			prevent it from inserting file names or timestamps
			into the compressed output.
			[${TOOL_GZIP} ${GZIP_N_FLAG}]

TOOL_HEXDUMP		Ascii, decimal, hexadecimal, octal dump.  [hexdump]

TOOL_HP300MKBOOT	Make bootable image for hp300.  [hp300-mkboot]

TOOL_HPPAMKBOOT		Make bootable image for hppa.  [hppa-mkboot]

TOOL_INDXBIB		Make bibliographic database's inverted index.  [indxbib]

TOOL_INSTALLBOOT	Install disk bootstrap software.  [installboot]

TOOL_INSTALL_INFO	Update info/dir entries.  [install-info]

TOOL_JOIN		Relational database operator.  [join]

TOOL_M4			M4 macro language processor.  [m4]

TOOL_MACPPCFIXCOFF	Fix up xcoff headers for macppc.  [macppc-fixcoff]

TOOL_MAKEFS		Create file system image from directory tree.  [makefs]

TOOL_MAKEINFO		Translate Texinfo documents.  [makeinfo]

TOOL_MAKEWHATIS		Create a whatis.db database.  [makewhatis]

TOOL_MDSETIMAGE		Set kernel RAM disk image.  [mdsetimage]

TOOL_MENUC		Menu compiler.  [menuc]

TOOL_MIPSELF2ECOFF	Convert ELF-format executable to ECOFF for mips.
			[mips-elf2ecoff]

TOOL_MKCSMAPPER		Make charset mapping table.  [mkcsmapper]

TOOL_MKESDB		Make encoding scheme database.  [mkesdb]

TOOL_MKLOCALE		Make LC_CTYPE locale files.  [mklocale]

TOOL_MKMAGIC		Create database for file(1).  [file]

TOOL_MKNOD		Make device special file.  [mknod]

TOOL_MKTEMP		Make (unique) temporary file name.  [mktemp]

TOOL_MSGC		Simple message list compiler.  [msgc]

TOOL_MTREE		Map a directory hierarchy.  [mtree]

TOOL_NCDCS		Turn ELF kernel into a NCD firmware image. [ncdcs]

TOOL_PAX		Manipulate file archives and copy directories.  [pax]

TOOL_PIC		Compile pictures for groff.  [pic]

TOOL_PIGZ		Parallel compressor.  [pigz]

TOOL_POWERPCMKBOOTIMAGE	Make bootable image for powerpc.  [powerpc-mkbootimage]

TOOL_PWD_MKDB		Generate the password databases.  [pwd_mkdb]

TOOL_REFER		Preprocess bibliographic references for groff.  [refer]

TOOL_ROFF_ASCII		Generate ASCII groff output.  [nroff]

TOOL_ROFF_DVI		Generate DVI groff output.  [${TOOL_GROFF} -Tdvi]

TOOL_ROFF_HTML		Generate HTML groff output.
			[${TOOL_GROFF} -Tlatin1 -mdoc2html]

TOOL_ROFF_PS		Generate PS groff output.  [${TOOL_GROFF} -Tps]

TOOL_ROFF_RAW		Generate "raw" groff output.  [${TOOL_GROFF} -Z]

TOOL_RPCGEN		Remote Procedure Call (RPC) protocol compiler.  [rpcgen]

TOOL_SED		Stream editor.  [sed]

TOOL_SOELIM		Eliminate .so's from groff input.  [soelim]

TOOL_SPARKCRC		Generate a crc suitable for use in a sparkive file.
			[sparkcrc]

TOOL_STAT		Display file status.  [stat]

TOOL_STRFILE		Create a random access file for storing strings.
			[strfile]

TOOL_SUNLABEL		Read or modify a SunOS disk label.  [sunlabel]

TOOL_TBL		Format tables for groff.  [tbl]

TOOL_UUDECODE		Uudecode a binary file.  [uudecode]

TOOL_VGRIND		Grind nice listings of programs.  [vgrind -f]

TOOL_ZIC		Time zone compiler.  [zic]

For each possible value of MACHINE_CPU, MACHINES.${MACHINE_CPU} contain a
list of what ports can be built for it.  This keeps those definitions in
centralized place.

<bsd.own.mk> is generally useful when building your own Makefiles so that
they use the same default owners etc. as the rest of the tree.


=-=-=-=-=   bsd.clean.mk   =-=-=-=-=

The include file <bsd.clean.mk> defines the clean and cleandir
targets.  It uses the following variables:

CLEANFILES	Files to remove for both the clean and cleandir targets.

CLEANDIRFILES	Files to remove for the cleandir target, but not for
		the clean target.

MKCLEANSRC	Controls whether or not the clean and cleandir targets
		will delete files from both the object directory,
		${.OBJDIR}, and the source directory, ${.CURDIR}.

		If MKCLEANSRC is set to "no", then the file names in
		CLEANFILES or CLEANDIRFILES are interpreted relative
		to the object directory, ${.OBJDIR}.  This is the
		traditional behaviour.

		If MKCLEANSRC is set to "yes", then the file deletion
		is performed relative to both the object directory,
		${.OBJDIR}, and the source directory, ${.CURDIR}.  (This
		has no effect if ${.OBJDIR} is the same as ${.CURDIR}.)
		Deleting files from ${.CURDIR} is intended to remove
		stray output files that had been left in the source
		directory by an earlier build that did not use object
		directories.

		The default is MKCLEANSRC=yes.  If you always build with
		separate object directories, and you are sure that there
		are no stray files in the source directories, then you
		may set MKCLEANSRC=no to save some time.

MKCLEANVERIFY	Controls whether or not the clean and cleandir targets
		will verify that files have been deleted.

		If MKCLEANVERIFY is set to "no", then the files will
		be deleted using a "rm -f" command, and its success or
		failure will be ignored.

		If MKCLEANVERIFY is set to "yes", then the success of
		the "rm -f" command will be verified using an "ls"
		command.

		The default is MKCLEANVERIFY=yes.  If you are sure that
		there will be no problems caused by file permissions,
		read-only file systems, or the like, then you may set
		MKCLEANVERIFY=no to save some time.

To use the clean and cleandir targets defined in <bsd.clean.mk>, other
Makefiles or bsd.*.mk files should append file names to the CLEANFILES
or CLEANDIRFILES variables.  For example:

	    CLEANFILES+= a.out
	    CLEANDIRFILES+= .depend

	    .include <bsd.clean.mk>

The files listed in CLEANFILES and CLEANDIRFILES must not be
directories, because the potential risk from running "rm -rf" commands
in bsd.clean.mk is considered too great.  If you want to recursively
delete a directory as part of "make clean" or "make cleandir" then you
need to provide your own target.

=-=-=-=-=   bsd.dep.mk   =-=-=-=-=

The include file <bsd.dep.mk> contains the default targets for building
.depend files.  It creates .d files from entries in SRCS and DPSRCS
that are C, C++, or Objective C source files, and builds .depend from the
.d files.  All other files in SRCS and all of DPSRCS will be used as
dependencies for the .d files.  In order for this to function correctly,
it should be .included after all other .mk files and directives that may
modify SRCS or DPSRCS.  It uses the following variables:

SRCS		List of source files to build the program.

DPSRCS		List of source files which are needed for generating
		dependencies, but are not needed in ${SRCS}.


=-=-=-=-=   bsd.files.mk   =-=-=-=-=

The include file <bsd.files.mk> handles the FILES variables and is included
from <bsd.lib.mk> and <bsd.prog.mk>, and uses the following variables:

FILES		The list of files to install.

CONFIGFILES	Similar semantics to FILES, except that the files
		are installed by the `configinstall' target,
		not the `install' target.
		The FILES* variables documented below also apply.

FILESOWN	File owner.  [${BINOWN}]

FILESGRP	File group.  [${BINGRP}]

FILESMODE	File mode.  [${NONBINMODE}]

FILESDIR	The location to install the files.

FILESNAME	Optional name to install each file as.

FILESOWN_<fn>	File owner of the specific file <fn>.

FILESGRP_<fn>	File group of the specific file <fn>.

FILESMODE_<fn>	File mode of the specific file <fn>.

FILESDIR_<fn>	The location to install the specific file <fn>.

FILESNAME_<fn>	Optional name to install <fn> as.

FILESBUILD	If this variable is defined, then its value will be
		used as the default for all FILESBUILD_<fn> variables.
		Otherwise, the default will be "no".

FILESBUILD_<fn>	A value different from "no" will add the file to the list of
		targets to be built by `realall'.  Users of that variable
		should provide a target to build the file.


BUILDSYMLINKS	List of two word items:
			lnsrc lntgt
		For each lnsrc item, create a symlink named lntgt.
		The lntgt symlinks are removed by the cleandir target.

UUDECODE_FILES	List of files which are stored as <file>.uue in the source
		tree. Each one will be decoded with ${TOOL_UUDECODE}.
		The source files have a `.uue' suffix, the generated files do
		not.

UUDECODE_FILES_RENAME_<fn>
		Rename the output from the decode to the provided name.
		
		*NOTE: These files are simply decoded, with no install or other
		       rule applying implicitly except being added to the clean
		       target.

=-=-=-=-=   bsd.gcc.mk   =-=-=-=-=

The include file <bsd.gcc.mk> computes various parameters related to GCC
support libraries.  It defines no targets.  <bsd.own.mk> MUST be included
before <bsd.gcc.mk>.

The primary users of <bsd.gcc.mk> are <bsd.prog.mk> and <bsd.lib.mk>, each
of which need to know where to find certain GCC support libraries.

The behavior of <bsd.gcc.mk> is influenced by the EXTERNAL_TOOLCHAIN variable,
which is generally set by the user.  If EXTERNAL_TOOLCHAIN it set, then
the compiler is asked where to find the support libraries, otherwise the
support libraries are found in ${DESTDIR}/usr/lib.

<bsd.gcc.mk> sets the following variables:

_GCC_CRTBEGIN	The full path name to crtbegin.o.

_GCC_CRTBEGINS	The full path name to crtbeginS.o.

_GCC_CRTEND	The full path name to crtend.o.

_GCC_CRTENDS	The full path name to crtendS.o.

_GCC_LIBGCCDIR	The directory where libgcc.a is located.


=-=-=-=-=   bsd.inc.mk   =-=-=-=-=

The include file <bsd.inc.mk> defines the includes target and uses the
variables:

INCS		The list of include files.

INCSDIR		The location to install the include files.

INCSNAME	Target name of the include file, if only one; same as
		FILESNAME, but for include files.

INCSYMLINKS	Similar to SYMLINKS in <bsd.links.mk>, except that these
		are installed in the 'includes' target and not the
		(much later) 'install' target.

INCSNAME_<file>	The name file <file> should be installed as, if not <file>,
		same as FILESNAME_<file>, but for include files.


=-=-=-=-=   bsd.info.mk   =-=-=-=-=

The include file <bsd.info.mk> is used to generate and install GNU Info
documentation from respective Texinfo source files.  It defines three
implicit targets (.txi.info, .texi.info, and .texinfo.info), and uses the
following variables:

TEXINFO		List of Texinfo source files.  Info documentation will
		consist of single files with the extension replaced by
		.info.

INFOFLAGS	Flags to pass to makeinfo.  []


=-=-=-=-=   bsd.kernobj.mk   =-=-=-=-=

The include file <bsd.kernobj.mk> defines variables related to the
location of kernel sources and object directories.

KERNSRCDIR	Is the location of the top of the kernel src.
		[${_SRC_TOP_}/sys]

KERNARCHDIR	Is the location of the machine dependent kernel sources.
		[arch/${MACHINE}]

KERNCONFDIR	Is where the configuration files for kernels are found.
		[${KERNSRCDIR}/${KERNARCHDIR}/conf]

KERNOBJDIR	Is the kernel build directory.  The kernel GENERIC for
		instance will be compiled in ${KERNOBJDIR}/GENERIC.
		The default value is
		${MAKEOBJDIRPREFIX}${KERNSRCDIR}/${KERNARCHDIR}/compile
		if it exists or the target 'obj' is being made.
		Otherwise the default is
		${KERNSRCDIR}/${KERNARCHDIR}/compile.

It is important that Makefiles (such as those under src/distrib) that
wish to find compiled kernels use <bsd.kernobj.mk> and ${KERNOBJDIR}
rather than make assumptions about the location of the compiled kernel.


=-=-=-=-=   bsd.kinc.mk   =-=-=-=-=

The include file <bsd.kinc.mk> defines the many targets (includes,
subdirectories, etc.), and is used by kernel makefiles to handle
include file installation.  It is intended to be included alone, by
kernel Makefiles.  It uses similar variables to <bsd.inc.mk>.
Please see <bsd.kinc.mk> for more details, and keep the documentation
in that file up to date.

=-=-=-=-=   bsd.syscall.mk =-=-=-=-=

The include file <bsd.syscall.mk> contains the logic to create syscall
files for various emulations. It includes <bsd.kinc.mk> to handle the
rest of the targets.

=-=-=-=-=   bsd.lib.mk   =-=-=-=-=

The include file <bsd.lib.mk> has support for building libraries.  It has
the same eight targets as <bsd.prog.mk>: all, clean, cleandir, depend,
includes, install, lint, and tags.  Additionally, it has a checkver target
which checks for installed shared object libraries whose version is greater
that the version of the source. It has a limited number of suffixes,
consistent with the current needs of the BSD tree.  <bsd.lib.mk> includes
<bsd.shlib.mk> to get shared library parameters.

It sets/uses the following variables:

LIB		The name of the library to build.

LIBDIR		Target directory for libraries.

MKARZERO	Normally, ar(1) sets the timestamps, uid, gid and
		permissions in files inside its archives to those of
		the file it was fed. This leads to non-reproducible
		builds. If MKARZERO is set to "yes" (default is the
		same as MKREPRO, or "no" if MKREPRO is not defined),
		then the "D" flag is passed to ar, causing the
		timestamp, uid and gid to be zeroed and the file
		permissions to be set to 644. This allows .a files
		from different builds to be bit identical.

SHLIBINSTALLDIR	Target directory for shared libraries if ${USE_SHLIBDIR}
		is not "no".

SHLIB_MAJOR
SHLIB_MINOR
SHLIB_TEENY	Major, minor, and teeny version numbers of shared library

USE_SHLIBDIR	If not "no", use ${SHLIBINSTALLDIR} instead of ${LIBDIR}
		as the path to install shared libraries to.
		USE_SHLIBDIR must be defined before <bsd.own.mk> is included.
		Default: no

LIBISMODULE	If not "no", install as ${LIB}.so (without the "lib" prefix),
		and act as "MKDEBUGLIB=no MKLINT=no MKPICINSTALL=no
		MKPROFILE=no MKSTATICLIB=no".
		Default: no

LIBISPRIVATE	If not "no", act as "MKDEBUGLIB=no MKLINT=no MKPIC=no
		MKPROFILE=no", and don't install the (.a) library.
		This is useful for "build only" helper libraries.
		Default: no

LIBISCXX	If not "no", Use ${CXX} instead of ${CC} to link
		shared libraries.
		This is useful for C++ libraries.
		Default: no

LINTLIBDIR	Target directory for lint libraries.

LIBGRP		Library group.

LIBOWN		Library owner.

LIBMODE		Library mode.

LDADD		Additional loader objects.

MAN		The manual pages to be installed (use a .1 - .9 suffix).

NOCHECKVER_<library>
NOCHECKVER	If set, disables checking for installed shared object
		libraries with versions greater than the source.  A
		particular library name, without the "lib" prefix, may
		be appended to the variable name to disable the check for
		only that library.

SRCS		List of source files to build the library.  Suffix types
		.s, .c, and .f are supported.  Note, .s files are preferred
		to .c files of the same name.  (This is not the default for
		versions of make.)

LIBDPLIBS	A list of the tuples:
			libname  path-to-srcdir-of-libname

		For each tuple;
		     *	LIBDO.libname contains the .OBJDIR of the library
			`libname', and if it is not set it is determined
			from the srcdir and added to MAKEOVERRIDES (the
			latter is to allow for build time optimization).
		     *	LDADD gets  -L${LIBDO.libname} -llibname    added.
		     *	DPADD gets  ${LIBDO.libname}/liblibname.so  or
				    ${LIBDO.libname}/liblibname.a   added.

		The special value "_external" for LIBDO.lib makes the
		build system to assume the library comes from outside
		of the NetBSD source tree and only causes -llibname
		to be added to LDADD.

		This variable may be used for individual libraries, as
		well as in parent directories to cache common libraries
		as a build-time optimization.

The include file <bsd.lib.mk> includes the file named "../Makefile.inc"
if it exists, as well as the include file <bsd.man.mk>.

It has rules for building profiled objects; profiled libraries are
built by default.

Libraries are ranlib'd when made.


=-=-=-=-=   bsd.links.mk   =-=-=-=-=

The include file <bsd.links.mk> handles the LINKS and SYMLINKS variables
and is included from from <bsd.lib.mk> and <bsd.prog.mk>.

LINKSOWN, LINKSGRP, and LINKSMODE, are relevant only if a metadata log
is used. The defaults may be modified by other bsd.*.mk files which
include bsd.links.mk.  In the future, these variables may be replaced
by a method for explicitly recording hard links in a metadata log.

LINKS		The list of hard links, consisting of pairs of paths:
			source-file target-file
		${DESTDIR} is prepended to both paths before linking.
		For example, to link /bin/test and /bin/[, use:
			LINKS=/bin/test /bin/[

CONFIGLINKS	Similar semantics to LINKS, except that the links
		are installed by the `configinstall' target,
		not the `install' target.

SYMLINKS	The list of symbolic links, consisting of pairs of paths:
			source-file target-file
		${DESTDIR} is only prepended to target-file before linking.
		For example, to symlink /usr/bin/tar to /bin/tar resulting
		in ${DESTDIR}/usr/bin/tar -> /bin/tar:
			SYMLINKS=/bin/tar /usr/bin/tar

CONFIGSYMLINKS	Similar semantics to SYMLINKS, except that the symbolic links
		are installed by the `configinstall' target,
		not the `install' target.

LINKSOWN	Link owner.  [${BINOWN}]

LINKSGRP	Link group.  [${BINGRP}]

LINKSMODE	Link mode.  [${NONBINMODE}]

LINKSOWN_<fn>	Link owner of the specific file <fn>.

LINKSGRP_<fn>	Link group of the specific file <fn>.

LINKSMODE_<fn>	Link mode of the specific file <fn>.


=-=-=-=-=   bsd.man.mk   =-=-=-=-=

The include file <bsd.man.mk> handles installing manual pages and their
links.

It has a three targets:

	catinstall:
		Install the preformatted manual pages and their links.
	htmlinstall:
		Install the HTML manual pages and their links.
	maninstall:
		Install the manual page sources and their links.

It sets/uses the following variables:

MANDIR		Base path for manual installation.

MANGRP		Manual group.

MANOWN		Manual owner.

MANMODE		Manual mode.

MANSUBDIR	Subdirectory under the manual page section, i.e. "/vax"
		or "/tahoe" for machine specific manual pages.

MAN		The manual pages to be installed (use a .1 - .9 suffix).

MLINKS		List of manual page links (using a .1 - .9 suffix).  The
		linked-to file must come first, the linked file second,
		and there may be multiple pairs.

The include file <bsd.man.mk> includes a file named "../Makefile.inc" if
it exists.


=-=-=-=-=   bsd.obj.mk   =-=-=-=-=

The include file <bsd.obj.mk> defines targets related to the creation
and use of separated object and source directories.

If an environment variable named MAKEOBJDIRPREFIX is set, make(1) uses
${MAKEOBJDIRPREFIX}${.CURDIR} as the name of the object directory if
it exists.  Otherwise make(1) looks for the existence of a
subdirectory (or a symlink to a directory) of the source directory
into which built targets should be placed.  If an environment variable
named MAKEOBJDIR is set, make(1) uses its value as the name of the
object directory; failing that, make first looks for a subdirectory
named "obj.${MACHINE}", and if that doesn't exist, it looks for "obj".

Object directories are not created automatically by make(1) if they
don't exist; you need to run a separate "make obj".  (This will happen
during a top-level build if "MKOBJDIRS" is set to a value other than
"no").  When the source directory is a subdirectory of ${BSDSRCDIR} --
and this is determined by a simple string prefix comparison -- object
directories are created in a separate object directory tree, and a
symlink to the object directory in that tree is created in the source
directory; otherwise, "make obj" assumes that you're not in the main
source tree and that it's not safe to use a separate object tree.

Several variables used by <bsd.obj.mk> control exactly what
directories and links get created during a "make obj":

MAKEOBJDIR	If set, this is the component name of the object
		directory.

OBJMACHINE	If this is set but MAKEOBJDIR is not set, creates
		object directories or links named "obj.${MACHINE}";
		otherwise, just creates ones named "obj".

USR_OBJMACHINE  If set, and the current directory is a subdirectory of
		${BSDSRCDIR}, create object directory in the
		corresponding subdirectory of ${BSDOBJDIR}.${MACHINE};
		otherwise, create it in the corresponding subdirectory
		of ${BSDOBJDIR}

BUILDID		If set, the contents of this variable are appended
		to the object directory name.  If OBJMACHINE is also
		set, ".${BUILDID}" is added after ".${MACHINE}".


=-=-=-=-=   bsd.prog.mk   =-=-=-=-=

The include file <bsd.prog.mk> handles building programs from one or
more source files, along with their manual pages.  It has a limited number
of suffixes, consistent with the current needs of the BSD tree.
<bsd.prog.mk> includes <bsd.shlib.mk> to get shared library parameters.

It has eight targets:

	all:
		build the program and its manual page.  This also
		creates a GDB initialization file (.gdbinit) in
		the objdir.  The .gdbinit file sets the shared library
		prefix to ${DESTDIR} to facilitate cross-debugging.
	clean:
		remove the program, any object files and the files a.out,
		Errs, errs, mklog, and ${PROG}.core.
	cleandir:
		remove all of the files removed by the target clean, as
		well as .depend, tags, and any manual pages.
		`distclean' is a synonym for `cleandir'.
	depend:
		make the dependencies for the source files, and store
		them in the file .depend.
	includes:
		install any header files.
	install:
		install the program and its manual pages; if the Makefile
		does not itself define the target install, the targets
		beforeinstall and afterinstall may also be used to cause
		actions immediately before and after the install target
		is executed.
	lint:
		run lint on the source files
	tags:
		create a tags file for the source files.

It sets/uses the following variables:

BINGRP		Binary group.

BINOWN		Binary owner.

BINMODE		Binary mode.

CLEANDIRFILES	Additional files to remove for the cleandir target.

CLEANFILES	Additional files to remove for the clean and cleandir targets.

CONFIGOPTS	Additional flags to config(1) when building kernels.

COPTS		Additional flags to the compiler when creating C objects.

COPTS.<fn>	Additional flags to the compiler when creating the
		C objects for <fn>.
		For <fn>.[ly], "<fn>.c" must be used.

CPUFLAGS	Additional flags to the compiler/assembler to select
		CPU instruction set options, CPU tuning options, etc.

CPUFLAGS.<fn>	Additional flags to the compiler/assembler for <fn>.
		For <fn>.[ly], "<fn>.c" must be used.

CPPFLAGS	Additional flags to the C pre-processor.

CPPFLAGS.<fn>	Additional flags to the C pre-processor for <fn>.
		For <fn>.[ly], "<fn>.c" must be used.

GDBINIT		List of GDB initialization files to add to "source"
		directives in the .gdbinit file that is created in the
		objdir.

LDADD		Additional loader objects.  Usually used for libraries.
		For example, to load with the compatibility and utility
		libraries, use:

			LDADD+=-lutil -lcompat

LDFLAGS		Additional linker flags (passed to ${CC} during link).

LINKS		See <bsd.links.mk>

OBJCOPTS	Additional flags to the compiler when creating ObjC objects.

OBJCOPTS.<fn>	Additional flags to the compiler when creating the
		ObjC objects for <fn>.
		For <fn>.[ly], "<fn>.c" must be used.

SYMLINKS	See <bsd.links.mk>

MAN		Manual pages (should end in .1 - .9).  If no MAN variable is
		defined, "MAN=${PROG}.1" is assumed.

PAXCTL_FLAGS	If defined, run paxctl(1) on the program binary after link
		time, with the value of this variable as args to paxctl(1).

PAXCTL_FLAGS.${PROG} Custom override for PAXCTL_FLAGS.

PROG		The name of the program to build.  If not supplied, nothing
		is built.

PROG_CXX	If defined, the name of the program to build.  Also
		causes <bsd.prog.mk> to link the program with the C++
		compiler rather than the C compiler.  PROG_CXX overrides
		the value of PROG if PROG is also set.

PROGNAME	The name that the above program will be installed as, if
		different from ${PROG}.

SRCS		List of source files to build the program.  If SRCS is not
		defined, it's assumed to be ${PROG}.c.

DPSRCS		List of source files which are needed for generating
		dependencies, but are not needed in ${SRCS}.

DPADD		Additional dependencies for the program.  Usually used for
		libraries.  For example, to depend on the compatibility and
		utility libraries use:

			DPADD+=${LIBCOMPAT} ${LIBUTIL}

		The following system libraries are predefined for DPADD:

		LIBARCHIVE?=	${DESTDIR}/usr/lib/libarchive.a
		LIBASN1?=	${DESTDIR}/usr/lib/libasn1.a
		LIBATF_C?=	${DESTDIR}/usr/lib/libatf-c.a
		LIBATF_CXX?=	${DESTDIR}/usr/lib/libatf-c++.a
		LIBBIND9?=	${DESTDIR}/usr/lib/libbind9.a
		LIBBLUETOOTH?=	${DESTDIR}/usr/lib/libbluetooth.a
		LIBBSDMALLOC?=	${DESTDIR}/usr/lib/libbsdmalloc.a
		LIBBZ2?=	${DESTDIR}/usr/lib/libbz2.a
		LIBC?=		${DESTDIR}/usr/lib/libc.a
		LIBCOMPAT?=	${DESTDIR}/usr/lib/libcompat.a
		LIBCOM_ERR?=	${DESTDIR}/usr/lib/libcom_err.a
		LIBCRT0?=	${DESTDIR}/usr/lib/crt0.o
		LIBCRTI?=	${DESTDIR}/usr/lib/crti.o
		LIBCRYPT?=	${DESTDIR}/usr/lib/libcrypt.a
		LIBCRYPTO?=	${DESTDIR}/usr/lib/libcrypto.a
		LIBCURSES?=	${DESTDIR}/usr/lib/libcurses.a
		LIBC_PIC?=	${DESTDIR}/usr/lib/libc_pic.a
		LIBDBM?=	${DESTDIR}/usr/lib/libdbm.a
		LIBDES?=	${DESTDIR}/usr/lib/libdes.a
		LIBDNS?=	${DESTDIR}/usr/lib/libdns.a
		LIBEDIT?=	${DESTDIR}/usr/lib/libedit.a
		LIBEVENT?=	${DESTDIR}/usr/lib/libevent.a
		LIBEVENT_OPENSSL?=	${DESTDIR}/usr/lib/libevent_openssl.a
		LIBEVENT_PTHREADS?=	${DESTDIR}/usr/lib/libevent_pthreads.a
		LIBEXECINFO?=	${DESTDIR}/usr/lib/libexecinfo.a
		LIBEXPAT?=	${DESTDIR}/usr/lib/libexpat.a
		LIBFETCH?=	${DESTDIR}/usr/lib/libfetch.a
		LIBFORM?=	${DESTDIR}/usr/lib/libform.a
		LIBFL?=		${DESTDIR}/usr/lib/libfl.a
		LIBG2C?=	${DESTDIR}/usr/lib/libg2c.a
		LIBGCC?=	${DESTDIR}/usr/lib/libgcc.a
		LIBGNUMALLOC?=	${DESTDIR}/usr/lib/libgnumalloc.a
		LIBGSSAPI?=	${DESTDIR}/usr/lib/libgssapi.a
		LIBHDB?=	${DESTDIR}/usr/lib/libhdb.a
		LIBHEIMBASE?=	${DESTDIR}/usr/lib/libheimbase.a
		LIBHEIMNTLM?=	${DESTDIR}/usr/lib/libheimntlm.a
		LIBHX500?=	${DESTDIR}/usr/lib/libhx500.a
		LIBINTL?=	${DESTDIR}/usr/lib/libintl.a
		LIBIPSEC?=	${DESTDIR}/usr/lib/libipsec.a
		LIBISC?=	${DESTDIR}/usr/lib/libisc.a
		LIBISCCC?=	${DESTDIR}/usr/lib/libisccc.a
		LIBISCFG?=	${DESTDIR}/usr/lib/libiscfg.a
		LIBKADM5CLNT?=	${DESTDIR}/usr/lib/libkadm5clnt.a
		LIBKADM5SRV?=	${DESTDIR}/usr/lib/libkadm5srv.a
		LIBKAFS?=	${DESTDIR}/usr/lib/libkafs.a
		LIBKRB5?=	${DESTDIR}/usr/lib/libkrb5.a
		LIBKVM?=	${DESTDIR}/usr/lib/libkvm.a
		LIBL?=		${DESTDIR}/usr/lib/libl.a
		LIBLBER?=	${DESTDIR}/usr/lib/liblber.a
		LIBLDAP?=	${DESTDIR}/usr/lib/libldap.a
		LIBLDAP_R?=	${DESTDIR}/usr/lib/libldap_r.a
		LIBLUA?=	${DESTDIR}/usr/lib/liblua.a
		LIBLUTOK?=	${DESTDIR}/usr/lib/liblutok.a
		LIBLWRES?=	${DESTDIR}/usr/lib/liblwres.a
		LIBM?=		${DESTDIR}/usr/lib/libm.a
		LIBMAGIC?=	${DESTDIR}/usr/lib/libmagic.a
		LIBMENU?=	${DESTDIR}/usr/lib/libmenu.a
		LIBOBJC?=	${DESTDIR}/usr/lib/libobjc.a
		LIBOSSAUDIO?=	${DESTDIR}/usr/lib/libossaudio.a
		LIBPAM?=	${DESTDIR}/usr/lib/libpam.a
		LIBPANEL?=	${DESTDIR}/usr/lib/libpanel.a
		LIBPCAP?=	${DESTDIR}/usr/lib/libpcap.a
		LIBPCI?=	${DESTDIR}/usr/lib/libpci.a
		LIBPMC?=	${DESTDIR}/usr/lib/libpmc.a
		LIBPOSIX?=	${DESTDIR}/usr/lib/libposix.a
		LIBPTHREAD?=	${DESTDIR}/usr/lib/libpthread.a
		LIBPUFFS?=	${DESTDIR}/usr/lib/libpuffs.a
		LIBQUOTA?=	${DESTDIR}/usr/lib/libquota.a
		LIBRADIUS?=	${DESTDIR}/usr/lib/libradius.a
		LIBREFUSE?=	${DESTDIR}/usr/lib/librefuse.a
		LIBRESOLV?=	${DESTDIR}/usr/lib/libresolv.a
		LIBRMT?=	${DESTDIR}/usr/lib/librmt.a
		LIBROKEN?=	${DESTDIR}/usr/lib/libroken.a
		LIBRPCSVC?=	${DESTDIR}/usr/lib/librpcsvc.a
		LIBRT?=		${DESTDIR}/usr/lib/librt.a
		LIBRUMP?=	${DESTDIR}/usr/lib/librump.a
		LIBRUMPFS_CD9660FS?=${DESTDIR}/usr/lib/librumpfs_cd9660fs.a
		LIBRUMPFS_EFS?=	${DESTDIR}/usr/lib/librumpfs_efs.a
		LIBRUMPFS_EXT2FS?=${DESTDIR}/usr/lib/librumpfs_ext2fs.a
		LIBRUMPFS_FFS?=	${DESTDIR}/usr/lib/librumpfs_ffs.a
		LIBRUMPFS_HFS?=	${DESTDIR}/usr/lib/librumpfs_hfs.a
		LIBRUMPFS_LFS?=	${DESTDIR}/usr/lib/librumpfs_lfs.a
		LIBRUMPFS_MSDOSFS?=${DESTDIR}/usr/lib/librumpfs_msdosfs.a
		LIBRUMPFS_NFS?=	${DESTDIR}/usr/lib/librumpfs_nfs.a
		LIBRUMPFS_NTFS?=${DESTDIR}/usr/lib/librumpfs_ntfs.a
		LIBRUMPFS_SYSPUFFS?=${DESTDIR}/usr/lib/librumpfs_syspuffs.a
		LIBRUMPFS_TMPFS?=${DESTDIR}/usr/lib/librumpfs_tmpfs.a
		LIBRUMPFS_UDF?=	${DESTDIR}/usr/lib/librumpfs_udf.a
		LIBRUMPFS_UFS?=	${DESTDIR}/usr/lib/librumpfs_ufs.a
		LIBRUMPUSER?=	${DESTDIR}/usr/lib/librumpuser.a
		LIBSASLC?=	${DESTDIR}/usr/lib/libsaslc.a
		LIBSKEY?=	${DESTDIR}/usr/lib/libskey.a
		LIBSL?=		${DESTDIR}/usr/lib/libsl.a
		LIBSQLITE3?=	${DESTDIR}/usr/lib/libsqlite3.a
		LIBSS?=		${DESTDIR}/usr/lib/libss.a
		LIBSSH?=	${DESTDIR}/usr/lib/libssh.a
		LIBSSL?=	${DESTDIR}/usr/lib/libssl.a
		LIBSSP?=	${DESTDIR}/usr/lib/libssp.a
		LIBSTDCXX?=	${DESTDIR}/usr/lib/libstdc++.a
		LIBSUPCXX?=	${DESTDIR}/usr/lib/libsupc++.a
		LIBTERMINFO?=	${DESTDIR}/usr/lib/libterminfo.a
		LIBTRE?=	${DESTDIR}/usr/lib/libtre.a
		LIBUNBOUND?=	${DESTDIR}/usr/lib/libunbound.a
		LIBUSBHID?=	${DESTDIR}/usr/lib/libusbhid.a
		LIBUTIL?=	${DESTDIR}/usr/lib/libutil.a
		LIBWIND?=	${DESTDIR}/usr/lib/libwind.a
		LIBWRAP?=	${DESTDIR}/usr/lib/libwrap.a
		LIBY?=		${DESTDIR}/usr/lib/liby.a
		LIBZ?=		${DESTDIR}/usr/lib/libz.a

		The following X-Windows libraries are predefined for DPADD:

		LIBFS?=		${DESTDIR}/usr/X11R7/lib/libFS.a
		LIBGL?=		${DESTDIR}/usr/X11R7/lib/libGL.a
		LIBGLU?=	${DESTDIR}/usr/X11R7/lib/libGLU.a
		LIBICE?=	${DESTDIR}/usr/X11R7/lib/libICE.a
		LIBSM?=		${DESTDIR}/usr/X11R7/lib/libSM.a
		LIBX11?=	${DESTDIR}/usr/X11R7/lib/libX11.a
		LIBX11_XCB?=	${DESTDIR}/usr/X11R7/lib/libX11-xcb.a
		LIBXTRAP?=	${DESTDIR}/usr/X11R7/lib/libXTrap.a
		LIBXAU?=	${DESTDIR}/usr/X11R7/lib/libXau.a
		LIBXAW?=	${DESTDIR}/usr/X11R7/lib/libXaw.a
		LIBXCB?=	${DESTDIR}/usr/X11R7/lib/libxcb.a
		LIBXDMCP?=	${DESTDIR}/usr/X11R7/lib/libXdmcp.a
		LIBXEXT?=	${DESTDIR}/usr/X11R7/lib/libXext.a
		LIBXFONT?=	${DESTDIR}/usr/X11R7/lib/libXfont.a
		LIBXFONT2?=	${DESTDIR}/usr/X11R7/lib/libXfont2.a
		LIBXFT?=	${DESTDIR}/usr/X11R7/lib/libXft.a
		LIBXI?=		${DESTDIR}/usr/X11R7/lib/libXi.a
		LIBXINERAMA?=	${DESTDIR}/usr/X11R7/lib/libXinerama.a
		LIBXMU?=	${DESTDIR}/usr/X11R7/lib/libXmu.a
		LIBXMUU?=	${DESTDIR}/usr/X11R7/lib/libXmuu.a
		LIBXPM?=	${DESTDIR}/usr/X11R7/lib/libXpm.a
		LIBXRANDR?=	${DESTDIR}/usr/X11R7/lib/libXrandr.a
		LIBXRENDER?=	${DESTDIR}/usr/X11R7/lib/libXrender.a
		LIBXSS?=	${DESTDIR}/usr/X11R7/lib/libXss.a
		LIBXT?=		${DESTDIR}/usr/X11R7/lib/libXt.a
		LIBXTST?=	${DESTDIR}/usr/X11R7/lib/libXtst.a
		LIBXV?=		${DESTDIR}/usr/X11R7/lib/libXv.a
		LIBXXF86DGA?=	${DESTDIR}/usr/X11R7/lib/libXxf86dga.a
		LIBXXF86MISC?=	${DESTDIR}/usr/X11R7/lib/libXxf86misc.a
		LIBXXF86VM?=	${DESTDIR}/usr/X11R7/lib/libXxf86vm.a
		LIBDPS?=	${DESTDIR}/usr/X11R7/lib/libdps.a
		LIBFNTSTUBS?=	${DESTDIR}/usr/X11R7/lib/libfntstubs.a
		LIBFONTCONFIG?=	${DESTDIR}/usr/X11R7/lib/libfontconfig.a
		LIBFONTENC?=	${DESTDIR}/usr/X11R7/lib/libfontenc.a
		LIBFREETYPE?=	${DESTDIR}/usr/X11R7/lib/libfreetype.a
		LIBLBXUTIL?=	${DESTDIR}/usr/X11R7/lib/liblbxutil.a
		LIBXKBFILE?=	${DESTDIR}/usr/X11R7/lib/libxkbfile.a

SHAREDSTRINGS	If defined, a new .c.o rule is used that results in shared
		strings, using xstr(1). Note that this will not work with
		parallel makes.

STRIPFLAG	The flag passed to the install program to cause the binary
		to be stripped.

SUBDIR		A list of subdirectories that should be built as well.
		Each of the targets will execute the same target in the
		subdirectories.

SCRIPTS		A list of interpreter scripts [file.{sh,csh,pl,awk,...}].
		These are installed exactly like programs.

SCRIPTSDIR	The location to install the scripts.  Each script can be
		installed to a separate path by setting SCRIPTSDIR_<script>.

SCRIPTSNAME	The name that the above program will be installed as, if
		different from ${SCRIPTS}. These can be further specialized
		by setting SCRIPTSNAME_<script>.

FILES		See description of <bsd.files.mk>.

SHLINKDIR	Target directory for shared linker.  See description of
		<bsd.own.mk> for additional information about this variable.

The include file <bsd.prog.mk> includes the file named "../Makefile.inc"
if it exists, as well as the include file <bsd.man.mk>.

Some simple examples:

To build foo from foo.c with a manual page foo.1, use:

	PROG=	foo

	.include <bsd.prog.mk>

To build foo from foo.c with a manual page foo.2, add the line:

	MAN=	foo.2

If foo does not have a manual page at all, add the line:

	MKMAN=	no

If foo has multiple source files, add the line:

	SRCS=	a.c b.c c.c d.c


=-=-=-=-=   bsd.rpc.mk   =-=-=-=-=

The include file <bsd.rpc.mk> contains a makefile fragment used to
construct source files built by rpcgen.

The following macros may be defined in makefiles which include
<bsd.rpc.mk> in order to control which files get built and how they
are to be built:

RPC_INCS:	construct .h file from .x file
RPC_XDRFILES:	construct _xdr.c from .x file
		(for marshalling/unmarshalling data types)
RPC_SVCFILES:	construct _svc.c from .x file
		(server-side stubs)
RPC_SVCFLAGS:	Additional flags passed to builds of RPC_SVCFILES.

RPC_XDIR:	Directory containing .x/.h files


=-=-=-=-=   bsd.shlib.mk   =-=-=-=-=

The include file <bsd.shlib.mk> computes parameters for shared library
installation and use.  It defines no targets.  <bsd.own.mk> MUST be
included before <bsd.shlib.mk>.

<bsd.own.mk> sets the following variables, if they are not already defined
(defaults are in brackets):

SHLIBINSTALLDIR	If ${USE_SHLIBDIR} is not "no", use ${SHLIBINSTALLDIR}
		instead of ${LIBDIR} as the base path for shared library
		installation.  [/lib]

SHLIBDIR	The path to USE_SHLIBDIR shared libraries to use when building
		a program.  [/lib for programs in /bin and /sbin, /usr/lib
		for all others.]

_LIBSODIR	Set to ${SHLIBINSTALLDIR} if ${USE_SHLIBDIR} is not "no",
		otherwise set to ${LIBDIR}

SHLINKINSTALLDIR Base path for shared linker.  [/libexec]

SHLINKDIR	Path to use for shared linker when building a program.
		[/libexec for programs in /bin and /sbin, /usr/libexec for
		all others.]


=-=-=-=-=   bsd.subdir.mk   =-=-=-=-=

The include file <bsd.subdir.mk> contains the default targets for building
subdirectories.  It has the same eight targets as <bsd.prog.mk>: all,
clean, cleandir, depend, includes, install, lint, and tags.  It uses the
following variables:

NOSUBDIR	If this variable is defined, then the SUBDIR variable
		will be ignored and subdirectories will not be processed.

SUBDIR		For all of the directories listed in ${SUBDIR}, the
		specified directory will be visited and the target made.

		As a special case, the use of a token .WAIT as an
		entry in SUBDIR acts as a synchronization barrier
		when multiple make jobs are run; subdirs before the
		.WAIT must complete before any subdirs after .WAIT are
		started.  See make(1) for some caveats on use of .WAIT
		and other special sources.


=-=-=-=-=   bsd.x11.mk   =-=-=-=-=

The include file <bsd.x11.mk> contains parameters and targets for
cross-building X11 from ${X11SRCDIR.<package>}.  It should be included
after the general Makefile contents but before the include files such as
<bsd.prog.mk> and <bsd.lib.mk>.

It provides the following targets:
	.man.1 .man.3 .man.4 .man.5 .man.7:
		If ${MAN} or ${PROG} is set and ${MKMAN} != "no",
		these rules convert from X11's manual page source
		into an mdoc.old source file.

It sets the following variables:

BINDIR			Set to ${X11BINDIR}.
			To override, define after including <bsd.x11.mk>

LIBDIR			Set to ${X11USRLIBDIR}.
			To override, define after including <bsd.x11.mk>

MANDIR			Set to ${X11MANDIR}.
			To override, define after including <bsd.x11.mk>

CPPFLAGS		Appended with definitions to include from
			${DESTDIR}${X11INCDIR}

LDFLAGS			Appended with definitions to link from
			${DESTDIR}${X11USRLIBDIR}

X11FLAGS.CONNECTION	Equivalent to X11's CONNECTION_FLAGS.

X11FLAGS.EXTENSION	Equivalent to X11's EXT_DEFINES.

X11FLAGS.LOADABLE	Equivalent to X11's LOADABLE.

X11FLAGS.OS_DEFINES	Equivalent to X11's OS_DEFINES.

X11FLAGS.SERVER		Equivalent to X11's ServerDefines.

X11FLAGS.THREADLIB	Equivalent to X11's THREADS_DEFINES for libraries.

X11FLAGS.THREADS	Equivalent to X11's THREADS_DEFINES.

X11FLAGS.VERSION	cpp(1) definitions of OSMAJORVERSION and OSMINORVERSION.

X11FLAGS.DIX		Equivalent to X11's DIX_DEFINES.

X11TOOL_UNXCOMM		Commandline to convert `XCOMM' comments to `#'

It uses the following variables:

APPDEFS			List of app-default files to install.

CPPSCRIPTS		List of files/scripts to run through cpp(1)
			and then ${X11TOOL_UNXCOMM}.  The source files
			have a `.cpp' suffix, the generated files do not.

CPPSCRIPTFLAGS		Additional flags to cpp(1) when building CPPSCRIPTS.

CPPSCRIPTFLAGS_<fn>	Additional flags to cpp(1) when building CPPSCRIPT <fn>.


=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

The following files are described here for completion, but they are not
supposed to be included directly from other Makefiles; they are used
internally by other system files.

=-=-=-=-=   bsd.sys.mk   =-=-=-=-=

The include file <bsd.sys.mk> is used by other system mk files and
it is not intended to be included standalone. It contains rules and
system build variables. It requires bsd.own.mk to be included first.
It contains overrides that are used when building the NetBSD source tree.

The following variables control how various files are compiled/built.
(Note that these may be overridden in <bsd.own.mk> if USETOOLS == "yes"):

AR		Create, modify, and extract from archives.  [ar]

ARFLAGS		Options to ${AR}.  [rl]

AS		Assembler.  [as]

AFLAGS		Options to ${CC} when compiling or linking .s or .S
		assembly source files.  []

BUILDSEED	GCC uses random numbers when compiling C++ code.
		If this option is present, seed the random number
		generator based on the value, source file names and
		the output file name to make builds more deterministic.
		Additional information is available in the GCC
		documentation of -frandom-seed.

CC		C compiler.  [cc]

CFLAGS		Options to ${CC}.  [Usually -O or -O2]

CPP		C Pre-Processor.  [cpp]

CPPFLAGS	Options to ${CPP}.  []

CPUFLAGS	Optimization flags for ${CC}.  []

CXX		C++ compiler.  [c++]

CXXFLAGS	Options to ${CXX}.  [${CFLAGS}]

ELF2ECOFF	Convert ELF-format executable to ECOFF.  [elf2ecoff]

FC		Fortran compiler.  [f77]

FFLAGS		Options to {$FC}.  [-O]

HOST_SH		Shell.	This must be an absolute path, because it may be
		substituted into "#!" lines in scripts.	 [/bin/sh]

INSTALL		install(1) command.  [install]

LEX		Lexical analyzer.  [lex]

LFLAGS		Options to ${LEX}.  []

LPREFIX		Symbol prefix for ${LEX} (see -P option in lex(1)) [yy]

LD		Linker.  [ld]

LDFLAGS		Options to ${CC} during the link process.  []

LINT		C program verifier.  [lint]

LINTFLAGS	Options to ${LINT}.  [-chapbxzgFS]

LORDER		List dependencies for object files.  [lorder]

MAKE		make(1).  [make]

MKDEP		Construct Makefile dependency list.  [mkdep]

MKDEPCXX	Construct Makefile dependency list for C++ files.  [mkdep]

NM		List symbols from object files.  [nm]

PC		Pascal compiler.  [pc]  (Not present)

PFLAGS		Options to ${PC}.  []

OBJC		Objective C compiler.  [${CC}]

OBJCFLAGS	Options to ${OBJC}.  [${CFLAGS}]

OBJCOPY		Copy and translate object files.  [objcopy]

OBJCOPYLIBFLAGS	Flags to pass to objcopy when library objects are
		being built. [${.TARGET} =~ "*.po" ? -X : -x]

OBJDUMP		Display information from object files.  [objdump]

RANLIB		Generate index to archive.  [ranlib]

READELF		Display information from ELF object files.  [readelf]

SIZE		List section sizes and total size.  [size]

STRINGS		Display printable character sequences in files.  [strings]

STRIP		Discard symbols from object files.  [strip]

TSORT		Topological sort of a directed graph.  [tsort -q]

YACC		LALR(1) parser generator.  [yacc]

YFLAGS		Options to ${YACC}.  []

YHEADER		If defined, add "-d" to YFLAGS, and add dependencies
		from <file>.y to <file>.h and <file>.c, and add
		<foo>.h to CLEANFILES.

YPREFIX		If defined, add "-p ${YPREFIX}" to YFLAGS.


Other variables of note (incomplete list):

NOGCCERROR	If defined, prevents passing certain ${CFLAGS} to GCC
		that cause warnings to be fatal, such as:
			-Werror -Wa,--fatal-warnings
		(The latter being for as(1).)

NOCLANGERROR	If defined and clang is used as C compiler, -Werror is not
		passed to it.

WARNS		Crank up compiler warning options; the distinct levels are:
			WARNS=1
			WARNS=2
			WARNS=3
			WARNS=4
			WARNS=5
			WARNS=6

=-=-=-=-=   bsd.host.mk  =-=-=-=-=

This file is automatically included from bsd.own.mk. It contains settings
for all the HOST_* variables that are used in host programs and libraries.

HOST_AR			The host archive processing command

HOST_CC			The host c compiler

HOST_CFLAGS		The host c compiler flags

HOST_COMPILE.c		The host c compiler line with flags

HOST_COMPILE.cc		The host c++ compiler line with flags

HOST_CPP		The host c pre-processor

HOST_CPPFLAGS		The cost c pre-processor flags

HOST_CXX		The host c++ compiler

HOST_CXXFLAGS		The host c++ compiler flags

HOST_INSTALL_DIR	The host command to install a directory

HOST_INSTALL_FILE	The host command to install a file

HOST_INSTALL_SYMLINK	The host command to install a symlink

HOST_LD			The host linker command

HOST_LDFLAGS		The host linker flags

HOST_LINK.c		The host c linker line with flags

HOST_LINK.cc		The host c++ linker line with flags

HOST_LN			The host command to link two files

HOST_MKDEP		The host command to create dependencies for c programs

HOST_MKDEPCXX		The host command to create dependencies for c++ programs

HOST_OSTYPE		The host OSNAME-RELEASE-ARCH tupple

HOST_RANLIB		The host command to create random access archives

HOST_SH			The host Bourne shell interpreter name (absolute path)

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=