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UPDATING revision 1.367
      1 $NetBSD: UPDATING,v 1.367 2024/11/22 14:30:28 riastradh Exp $
      2 
      3 This file (UPDATING) is intended to be a brief reference to recent
      4 changes that might cause problems in the build process, and a guide for
      5 what to do if something doesn't work.
      6 
      7 For a more detailed description of the recommended way to build NetBSD
      8 using build.sh, see the BUILDING file.
      9 
     10 Note that much of the advice in this UPDATING file was written before
     11 build.sh existed.  Nevertheless, the advice here may be useful for
     12 working around specific problems with build.sh.
     13 
     14 Sections are marked with "^^^^^".  After the section on "Recent changes"
     15 are several sections containing more general information.
     16 
     17 See also: BUILDING, build.sh, Makefile.
     18 
     19 Recent changes:
     20 ^^^^^^^^^^^^^^^
     21 
     22 20241122:
     23 	Changes to bsd.lib.mk to improve detecting differences in
     24 	shared library symbol exports may cause some .actsym files in
     25 	the objdir to become stale in update builds.
     26 
     27 	To work around this, delete all files matching `*.actsym' in
     28 	the objdir.  For example:
     29 
     30 	find OBJDIR -name '*.actsym' -type f -print0 | xargs -0 rm
     31 
     32 20241104:
     33 	Changes around the integration of the zstd compression
     34 	library may require manual deletion of some object directories
     35 	if you update from a build from a few days ago:
     36 	rm -rf DESTDIR/usr/lib/*/libarchive*
     37 	rm -rf DESTDIR/usr/lib/*/libmagic*
     38 	rm -rf DESTDIR/usr/lib/*/libzstd*
     39 	rm -rf DESTDIR/usr/lib/libarchive*
     40 	rm -rf DESTDIR/usr/lib/libmagic*
     41 	rm -rf DESTDIR/usr/lib/libzstd*
     42 	rm -rf OBJDIR/compat/*/*/external/bsd/file/
     43 	rm -rf OBJDIR/compat/*/*/external/bsd/libarchive/
     44 	rm -rf OBJDIR/compat/*/*/external/bsd/zstd/
     45 	rm -rf OBJDIR/external/bsd/file/
     46 	rm -rf OBJDIR/external/bsd/libarchive/
     47 	rm -rf OBJDIR/external/bsd/zstd/
     48 	rm -rf OBJDIR/external/gpl3/gcc/
     49 	rm -rf OBJDIR/tools/gcc/
     50 
     51 20240926:
     52 	Building -current when running on amd64 from about 20240924
     53 	to about 20240926 will not work due to a "malloc_np.h"
     54 	error. Please downgrade to a version from 20240924 or older,
     55 	or upgrade to a newer version e.g. using a binary release from
     56 	the NetBSD build servers.
     57 
     58 20240923:
     59 	Update builds will require cleaning the object directories for
     60 	jemalloc (like: "rm -rf $OBJ/external/bsd/jemalloc*") and the
     61 	libc dependency files (like: "rm $OBJ/lib/libc/jemalloc.*").
     62 	On architectures with COMPAT libs, those also have to be cleaned,
     63 	e.g. on sparc64: "rm -rf $OBJ/compat/sparc64/sparc/external/bsd/jemalloc*"
     64 	and "rm $OBJ/compat/sparc64/sparc/lib/libc/jemalloc.*".
     65 
     66 20240817:
     67 	Update builds will require cleaning in src/external/historical/nawk/bin
     68 	in order to remove the awk binary since now there is a subdirectory
     69 	called awk.
     70 
     71 20240812:
     72 	Update builds will require removing the tools objdir for gdb
     73 	if building with MKCROSSGDB=yes. All architectures use gdb.old
     74 	now.
     75 
     76 20240630:
     77 	Update builds will require removing the tools objdir for binutils
     78 	(as most architectures should use binutils.old now).
     79 
     80 20240610:
     81 	Update builds are likely to require removing the objdir for
     82 	distrib/<arch>/cdroms - or at least references to libarchive
     83 	from within there after the recent libarchive update.
     84 
     85 20240504:
     86 	Update builds on x86 require making the `cleandir' target in
     87 	lib/libm, or deleting the objdir for lib/libm.
     88 
     89 20240423:
     90 	Update builds with x11 may fail after switching to Mesa 21.
     91 
     92 20240410:
     93 	Update builds may require manually deleting
     94 	$DESTDIR/var/run/named (and, potentially,
     95 	$DESTDIR/var/run/lwresd) in order to avoid checkflist failure.
     96 
     97 20240409:
     98 	32-bit compatibility libraries were moved into the base32
     99 	and debug32 sets.  HTML man pages were moved into the manhtml set.
    100 
    101 20230828:
    102 	If:
    103         - you updated to current and ran postinstall between 20230826
    104 	  and 20230828 inclusive, and
    105         - you are not using anything outside the base system to
    106 	  populate /etc/openssl/certs (e.g., manually adding
    107 	  certificates or using ca-certificates or mozilla-rootcerts or
    108 	  mozilla-rootcerts-openssl from pkgsrc),
    109 	delete /etc/openssl/certs and rerun postinstall or just
    110 	`certctl rehash'.
    111 
    112 	Otherwise, certctl(8) will think someone else has left
    113 	/etc/openssl/certs in the way and will avoid clobbering it on
    114 	upgrade from older NetBSD.
    115 
    116 20230718:
    117 	build.sh will use mk.conf in the same directory as build.sh instead
    118 	of /etc/mk.conf, unless MAKECONF is already defined in the environment.
    119 
    120 20230714:
    121 	Import of gcc 10.5 requires a clean build of at least tools/gcc
    122 	and external/gpl3/gcc* object directories. An update build
    123 	without cleaning will result in obscure failures in rare corner
    124 	cases.
    125 
    126 20230604:
    127 	Building native kernels with the installed make(1) instead of
    128 	the $TOOLDIR/bin/nbmake-${arch} wrapper will fail if userland
    129 	has not been updated. Note that this is an unsupported build
    130 	configuration (but usually works if userland is -current enough).
    131 
    132 20230523:
    133 	ctfmerge was fixed as macOS host tool. This may require a clean tools
    134 	rebuild to detect the update to tools/compat/configure.
    135 
    136 20230515:
    137 	New openssl build requires removal of the crypto/external/bsd/openssl
    138 	and tests/crypto/libcrypto subdirectories in the ${OBJDIR} hierarchy.
    139 	Otherwise test results may be wrong due to wrong "golden" output
    140 	files being installed.
    141 
    142 20230322:
    143 	Fixes for moved /lib/libisns* mean that builds will complain about
    144 	./usr/lib/libisns* being missing until src/lib/libisns is forced
    145 	to (re)install the files, including the symlinks.  The simplest
    146 	way is to clean this subdir before building.
    147 
    148 20230112:
    149 	New binutils require an updated ld.elf_so. If you are doing
    150 	(unsupported) in-place self builds (with the -E flag to build.sh),
    151 	make sure to have installed latest ld.elf_so before you rebuild
    152 	userland.
    153 
    154 20221116:
    155 	The addition to NetBSD's version of UFS2 of support for extended
    156 	attributes broke backward compatibility with previous releases
    157 	of NetBSD, so UFS2 has been restored to being compatible with
    158 	previous NetBSD releases by disabling extended attributes.
    159 	(Note that ACLs are implemented as extended attributes, so
    160 	this changes disables ACLs as well.)
    161 
    162 	Support for UFS2 with extended attributes is now available in a new
    163 	UFS variant called UFS2ea.  If you have created extended attributes
    164 	in an original UFS2 file system then "fsck -p" will now fail due to
    165 	the unexpected presence of extended attributes and "fsck -y" will
    166 	remove all extended attributes.  If you wish to preserve extended
    167 	attributes rather than delete them, there is a utility to convert
    168 	a UFS2 file system to UFS2ea and leave extended attributes in place,
    169 	but this should be used with caution since it will preserve any
    170 	extended attributes that have been corrupted by the backward
    171 	incompatibility too.
    172 
    173 	If you wish to use a UFS2ea file system as your root file system,
    174 	then you will need to update your boot loader to a version that
    175 	supports UFS2ea.
    176 
    177 	For more information, see:
    178 	https://wiki.netbsd.org/features/UFS2ea
    179 
    180 20221111:
    181 	The new libdrm import worsened the conflict issues for the
    182 	kdump/ktruss ioctl, and i915 now conflicts with base, and has
    183 	been turned off.  This will cause update build issues like:
    184 
    185 		kdump-ioctl.c:12175:143: error: 'DRM_IOCTL_I915_DESTROY_HEAP'
    186 		   undeclared here (not in a function);
    187 		   did you mean 'DRM_IOCTL_MODE_DESTROY_DUMB'?
    188 
    189 	You'll need to clean usr.bin/ktruss, usr.bin/kdump, and rescue.
    190 
    191 20220921:
    192 	Since the kernel version was bumped to 9.99.100, the bootloader
    193 	must be updated on x86 or EFI boot platforms in order to load
    194 	modules from boot.cfg(5) or interactively at the bootloader
    195 	prompt.
    196 
    197 	The kernel can still load modules at runtime, with modload(8)
    198 	or modules.conf(5), with no bootloader update.  This will not
    199 	affect release branches because it only applies to patch
    200 	numbers >=100.
    201 
    202 	On x86 (i386 or amd64) with BIOS boot, this requires copying a
    203 	new /usr/mdec/boot to /boot.  You can build this in the destdir
    204 	by running `$TOOLDIR/bin/nbmake-$ARCH dependall install' in
    205 	sys/arch/i386/stand.
    206 
    207 	On platforms with EFI boot (including x86 with EFI boot), this
    208 	requires copying a new /usr/mdec/boot*.efi to the EFI/BOOT/
    209 	directory on the EFI system partition.  The boot*.efi file is:
    210 
    211 	aarch64	bootaa64.efi
    212 	amd64	bootx64.efi
    213 	arm	bootarm.efi	(32-bit arm)
    214 	i386	bootx32.efi
    215 
    216 	You can build this in the destdir by running
    217 	`$TOOLDIR/bin/nbmake-$ARCH dependall install' in
    218 	sys/stand/efiboot/boot*.
    219 
    220 20220821:
    221 	Support for building extsrc/ has been deprecated.
    222 	EXTSRCSRCDIR and MKEXTSRC have been deprecated.
    223 
    224 20220714:
    225 	Updates to xorg-server and associated drivers may cause builds to
    226 	fail.  Cleaning both DESTDIR and the xorg build tree may be needed.
    227 
    228 20220628:
    229 	Changes in the build of src/games/robots require a clean build
    230 	of that program.
    231 
    232 20211116:
    233 	Changes in the xorg build require clean obj dirs for external/mit/xorg
    234 	(or a full clean/non-update build).
    235 
    236 20211112:
    237 	Device tree sources were updated for evbarm.  Some device nodes
    238 	(in particular, ld(4) devices on the ROCKPro64) will be renumbered.
    239 
    240 20211014:
    241 	MKPIE default for aarch64 has changed, a clean build is required.
    242 
    243 20210917:
    244 	Changed MNT_ACLS to default to POSIX1e ACLs instead of NFSv4
    245 	ACLs, to be compatible with FreeBSD. If you are using NFSv4 ACLs
    246 	and have "acls" in /etc/fstab you'll need to change it to "nfs4acls".
    247 
    248 20210711:
    249 	Updated GMP sources may require cleaning in tools/gmp and/or in
    250 	external/lgpl3/gmp/lib, particularly if GCC itself does not build.
    251 
    252 20210417:
    253 	GCC 10 was enabled for several platforms.  If builds fail in either
    254 	tools/gcc or external/gpl3/gcc, first try cleaning those objects and
    255 	removing the $DESTDIR/usr/include/g++ subdirectory.
    256 
    257 20201016:
    258 	MIPS kernel modules have been disabled until they work.  This will
    259 	turn up in extra files in the DESTDIR, which should be cleaned.
    260 
    261 20200925:
    262 	GNU MPC and MPFR have been updated.  At least MPFR needs cleaning
    263 	in both the tools and external dirs.
    264 
    265 20200912:
    266 	GCC 9 has arrived for Arm and x86 platforms, and will be coming
    267 	for several more, as will binutils 2.34.  Clean as required.
    268 
    269 20200907:
    270 	GCC 9 is coming, and binutils has been updated for MIPS.  This
    271 	probably requires cleaning the tools/binutils.
    272 
    273 20200811:
    274 	GCC updates may require cleaning the objdir.  This may occur
    275 	due to GCC 7.5 update, GCC 8.4 move to gcc.old, or the upcoming
    276 	GCC 9 upgrade.
    277 
    278 20200614:
    279 	blacklist* has been renamed to blocklist*. postinstall(8)
    280 	should handle the migration.
    281 
    282 20200601:
    283 	Due to a mistake in LIBISPRIVATE handling, .so libraries were
    284 	created in the build directories and need cleaning.
    285 
    286 20200311:
    287 	GCC 8 ports will need cleaning in src/tools/gcc and
    288 	src/external/gpl3/gcc due to GCC 8.4 update.
    289 
    290 20191118:
    291 	More architectures were switched to gcc8:
    292 	    i386, ia64 powerpc64, sparc, sparc64, arm
    293 	The same comments as in 20191022 apply.
    294 
    295 20191112:
    296 	The LLVM update requires a clean rebuild for all architectures using
    297 	LLVM during the tools build phase (i386, amd64, aarch64).
    298 
    299 20191022:
    300 	Ports amd64 and aarch64 switched to GCC 8.3 by default.
    301 	In-place ("expert mode", build.sh -E) builds are not supported
    302 	when going from a GCC 7 userland to GCC 8. Do a regular
    303 	build to a different DESTDIR (or preferably: build.sh -U) at least
    304 	once and install sets, or download comp.{tar.xz,tgz} from the
    305 	daily builds and install that before doing the next in-place build.
    306 
    307 20191001:
    308 	GCC 8.3 was imported.  Builds of src/tools/gcc may fail if
    309 	old builds with GCC 7 output now uses GCC 8.  Clean this
    310 	directory, and also clean src/external/gpl3/gcc.
    311 
    312 20190903:
    313 	Files with names that coincide with existing files' names on
    314 	case-insensitive file systems were inadvertently committed, for
    315 	radeon GPU firmware.  We cannot mark these as obsolete for
    316 	postinstall to fix, so if you updated src since 2019-08-26, and
    317 	ran build.sh distribution or ran build.sh release, you must
    318 	manually delete the following files in your DESTDIR (which is
    319 	usually $OBJDIR/destir.$ARCH), or from / if you have installed
    320 	them:
    321 
    322 		/libdata/firmware/radeon/bonaire_ce.bin
    323 		/libdata/firmware/radeon/bonaire_mc.bin
    324 		/libdata/firmware/radeon/bonaire_me.bin
    325 		/libdata/firmware/radeon/bonaire_mec.bin
    326 		/libdata/firmware/radeon/bonaire_pfp.bin
    327 		/libdata/firmware/radeon/bonaire_rlc.bin
    328 		/libdata/firmware/radeon/bonaire_sdma.bin
    329 		/libdata/firmware/radeon/bonaire_smc.bin
    330 		/libdata/firmware/radeon/bonaire_uvd.bin
    331 		/libdata/firmware/radeon/hainan_ce.bin
    332 		/libdata/firmware/radeon/hainan_mc.bin
    333 		/libdata/firmware/radeon/hainan_me.bin
    334 		/libdata/firmware/radeon/hainan_pfp.bin
    335 		/libdata/firmware/radeon/hainan_rlc.bin
    336 		/libdata/firmware/radeon/hainan_smc.bin
    337 		/libdata/firmware/radeon/hawaii_ce.bin
    338 		/libdata/firmware/radeon/hawaii_mc.bin
    339 		/libdata/firmware/radeon/hawaii_me.bin
    340 		/libdata/firmware/radeon/hawaii_mec.bin
    341 		/libdata/firmware/radeon/hawaii_pfp.bin
    342 		/libdata/firmware/radeon/hawaii_rlc.bin
    343 		/libdata/firmware/radeon/hawaii_sdma.bin
    344 		/libdata/firmware/radeon/hawaii_smc.bin
    345 		/libdata/firmware/radeon/kabini_ce.bin
    346 		/libdata/firmware/radeon/kabini_me.bin
    347 		/libdata/firmware/radeon/kabini_mec.bin
    348 		/libdata/firmware/radeon/kabini_pfp.bin
    349 		/libdata/firmware/radeon/kabini_rlc.bin
    350 		/libdata/firmware/radeon/kabini_sdma.bin
    351 		/libdata/firmware/radeon/kaveri_ce.bin
    352 		/libdata/firmware/radeon/kaveri_me.bin
    353 		/libdata/firmware/radeon/kaveri_mec.bin
    354 		/libdata/firmware/radeon/kaveri_mec2.bin
    355 		/libdata/firmware/radeon/kaveri_pfp.bin
    356 		/libdata/firmware/radeon/kaveri_rlc.bin
    357 		/libdata/firmware/radeon/kaveri_sdma.bin
    358 		/libdata/firmware/radeon/mullins_ce.bin
    359 		/libdata/firmware/radeon/mullins_me.bin
    360 		/libdata/firmware/radeon/mullins_mec.bin
    361 		/libdata/firmware/radeon/mullins_pfp.bin
    362 		/libdata/firmware/radeon/mullins_rlc.bin
    363 		/libdata/firmware/radeon/mullins_sdma.bin
    364 		/libdata/firmware/radeon/oland_ce.bin
    365 		/libdata/firmware/radeon/oland_mc.bin
    366 		/libdata/firmware/radeon/oland_me.bin
    367 		/libdata/firmware/radeon/oland_pfp.bin
    368 		/libdata/firmware/radeon/oland_rlc.bin
    369 		/libdata/firmware/radeon/oland_smc.bin
    370 		/libdata/firmware/radeon/pitcairn_ce.bin
    371 		/libdata/firmware/radeon/pitcairn_mc.bin
    372 		/libdata/firmware/radeon/pitcairn_me.bin
    373 		/libdata/firmware/radeon/pitcairn_pfp.bin
    374 		/libdata/firmware/radeon/pitcairn_rlc.bin
    375 		/libdata/firmware/radeon/pitcairn_smc.bin
    376 		/libdata/firmware/radeon/tahiti_ce.bin
    377 		/libdata/firmware/radeon/tahiti_mc.bin
    378 		/libdata/firmware/radeon/tahiti_me.bin
    379 		/libdata/firmware/radeon/tahiti_pfp.bin
    380 		/libdata/firmware/radeon/tahiti_rlc.bin
    381 		/libdata/firmware/radeon/tahiti_smc.bin
    382 		/libdata/firmware/radeon/verde_ce.bin
    383 		/libdata/firmware/radeon/verde_mc.bin
    384 		/libdata/firmware/radeon/verde_me.bin
    385 		/libdata/firmware/radeon/verde_pfp.bin
    386 		/libdata/firmware/radeon/verde_rlc.bin
    387 		/libdata/firmware/radeon/verde_smc.bin
    388 
    389 	We will re-import these radeon firmware images another way
    390 	later.
    391 
    392 20190727:
    393 	The uefi bootloader has gained tftp support and needs a clean
    394 	build. If you do update builds, manually clean its object
    395 	directory by something like:
    396 	cd sys/arch/i386/stand/efiboot && make clean
    397 
    398 20190723:
    399 	The jemalloc allocator in libc is now built without extended
    400 	debugging (for performance reasons). In update builds make sure
    401 	to rebuild it completely, by removing all affected object files,
    402 	including compat builds, something like:
    403 	cd /usr/obj && find . -type d -name jemalloc|xargs rm -rf
    404 
    405 20190207:
    406 	GCC 7 switched for many ports.  Update builds are likely to fail.
    407 
    408 Hints for a more successful build:
    409 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    410     Use build.sh, but do not use its "expert mode":
    411 	This will automatically build the tools in the
    412 	   correct order, and it will keep the tools and the
    413 	   new build products from interfering with the running
    414 	   system.  This will allow you to ignore most of the
    415 	   other advice in this file.
    416     Build a new kernel first:
    417 	This makes sure that any new system calls or features
    418 	   expected by the new userland will be present.  This
    419 	   helps to avoid critical errors when upgrading.
    420     Use object directories:
    421 	This helps to keep stale object
    422 	   files from polluting the build if a Makefile "forgets"
    423 	   about one.  It also makes it easier to clean up after
    424 	   a build.  It's also necessary if you want to use the
    425 	   same source tree for multiple machines.
    426 	   To use object directories with build.sh:
    427 	    a) invoke build.sh with the "-M" or "-O" options.
    428 	   To use object directories without using build.sh:
    429 	    a) cd /usr/src ; make cleandir
    430 	    b) Add "OBJMACHINE=yes" to /etc/mk.conf
    431 	    c) Add "MKOBJDIRS=yes" to /etc/mk.conf
    432 	    d) cd /usr/src ; make build
    433 	   Note that running "make obj" in a directory will create
    434 	   in obj.$MACHINE directory.
    435     Build to a DESTDIR:
    436 	This helps to keep old installed files (especially libraries)
    437 	   from interfering with the new build.
    438 	   To build to a DESTDIR with build.sh, use the "-D" option.
    439 	   To build to a DESTDIR without using build.sh, set the DESTDIR
    440 	   environment variable before running make build.  It should be
    441 	   set to the pathname of an initially empty directory.
    442 	   Problems: if you do not use build.sh, you might need to
    443 		update critical utilities without using DESTDIR since
    444 		nothing is executed from what is installed in DESTDIR.
    445 		(See critical utils, below.)
    446     Build often:
    447 	This keeps critical utilities current enough to not choke
    448 	on any other part of the source tree that depends on up to
    449 	date functionality.  If you use build.sh, you should not have
    450 	this problem.
    451 
    452 What to do if things don't work:
    453 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    454 When things don't work there are usually a few things that commonly
    455 should be done.
    456     1)	make includes
    457 	This should be done automatically by make build.
    458     2)  cd share/mk && make install
    459 	Again, automatically done by make build.
    460 
    461 Failsafe rebuild of a small part of the tree:
    462 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    463 To make sure you rebuild something correctly you want to do
    464 something like the following:
    465     1)  Make sure the includes and .mk files are up to date.
    466     2)  Make sure any program used to build the particular
    467 	utility is up to date.  (yacc, lex, etc...)
    468     3)  cd ...path/to/util...
    469 	make cleandir
    470 	rm ...all obj directories...
    471 	make cleandir			# yes, again
    472 	make obj
    473 	make depend && make
    474 
    475 Failsafe rebuild of the entire tree:
    476 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    477 If you really want to make sure the source tree is clean and
    478 ready for a build try the following.  Note that sourcing /etc/mk.conf
    479 (a make(1) Makefile) in this manner is not right, and will not work
    480 for anyone who uses any make(1) features in /etc/mk.conf.
    481 
    482 ---cut here---
    483 #!/bin/sh
    484 . /etc/mk.conf
    485 
    486 if [ -z $NETBSDSRCDIR ] ; then
    487     NETBSDSRCDIR=/usr/src
    488 fi
    489 if [ \! -d $NETBSDSRCDIR ] ; then
    490     echo Unable to find sources
    491     exit 1
    492 fi
    493 find $NETBSDSRCDIR -name \*.o -o -name obj.\* -o -name obj -exec rm \{\} \;
    494 
    495 if [ -z $BSDOBJDIR ] ; then
    496     BSDOBJDIR=/usr/obj
    497 fi
    498 if [ -d $BSDOBJDIR ] ; then
    499     rm -rf $BSDOBJDIR
    500 fi
    501 
    502 cd $NETBSDSRCDIR && make cleandir
    503 
    504 ---cut here---
    505 
    506 Critical utilities:
    507 ^^^^^^^^^^^^^^^^^^^
    508 	usr.bin/make
    509 	usr.bin/yacc
    510 	usr.bin/lex
    511 	usr.bin/xlint
    512 	usr.bin/config
    513 
    514 Other problems and possible solutions:
    515 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    516 Symptom:Complaints involving a Makefile.
    517 Fix:	Rebuild usr.bin/make:
    518 	cd usr.bin/make && make && make install
    519 	Or, a failsafe method if that doesn't work:
    520 	cd usr.bin/make && cc -DMAKE_NATIVE *.c -I. -o make \
    521 	&& install make /usr/bin
    522 
    523 Fix:	Make sure .mk files are up to date.
    524 	cd share/mk && make install
    525 
    526 Symptom:Kernel `config' fails to configure any kernel, including GENERIC.
    527 Fix:	Rebuild usr.bin/config
    528 
    529 Symptom:Obsolete intermediate files are used during compilation
    530 Fix:	Try the following sequence of commands in the directory in question.
    531 	make cleandir; rm `make print-objdir`; make cleandir; make obj
    532 	(If you built the tree without "make obj" in the past, obsolete files
    533 	may remain.  The command tries to clean everything up)
    534 
    535 Symptom:.../sysinst/run.c:xx: warning: initialization from incompatible
    536 	pointer type
    537 Fix:	Rebuild and install usr.bin/menuc
    538 
    539 Symptom:mklocale not found during build in share/locale/ctype
    540 Fix:	Build and install usr.bin/mklocale
    541 
    542 Symptom:undefined reference to `__assert13' or `__unsetenv13'
    543 Fix:    Rebuild and install lib/libc
    544 
    545 Symptom:usr.bin/config fails to build.
    546 Fix:	Try building with -DMAKE_BOOTSTRAP added to CFLAGS in Makefile.
    547 
    548 Symptom:undefined reference to `getprogname' or `setprogname'
    549 Fix:    Rebuild and install lib/libc
    550 
    551 Symptom:Update build fails in src/tools/gcc complaining that a variable
    552 	(e.g. CPPFLAGS) has changed since the previous run.
    553 Fix:    Run "nbmake-${ARCH} clean" in src/tools/gcc or do a clean build.
    554 
    555 Symptom:cvs [update aborted]: cannot open directory /cvsroot/src/...:
    556 	No such file or directory.
    557 Cause:	If a directory is created by mistake, then it is sometimes
    558 	deleted from the CVS repository using administrative commands
    559 	that bypass the normal cvs access controls.  If your cvs working tree
    560 	contains references to a directory that has been deleted on the
    561 	server in this way, then "cvs update" reports this error.
    562 Fix:	Recursively delete the affected directory from your working tree
    563 	and try the update again.
    564