UPDATING revision 1.379 1 $NetBSD: UPDATING,v 1.379 2025/04/27 23:30:39 kre 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 20250427:
23 The KERNEL_DIR option to build.sh is now functional. Set it
24 with ``-V KERNEL_DIR=yes'' on your build.sh command.
25 With this, you can now colocate kernel and associated modules
26 in /netbsd/{kernel,kernel.dbg,modules} instead of having the
27 kernel in / but modules in /stand.
28
29 Note that you'll need new bootstrap code to use this feature.
30
31 This completes work begun many years ago by christos@ :-)
32
33 20250413:
34 A change to bsd.lib.mk requires a clean build of all libraries.
35
36 20250131:
37 The switch to the new jemalloc requires cleaning in libc.
38
39 20241122:
40 Changes to various libraries' build options require cleaning
41 their objdirs in update builds:
42
43 cd external/bsd/file/lib && $TOOLDIR/bin/nbmake-$ARCH clean
44 cd external/bsd/libarchive/lib && $TOOLDIR/bin/nbmake-$ARCH clean
45 cd external/public-domain/xz/lib && $TOOLDIR/bin/nbmake-$ARCH clean
46
47 Also, for architectures with MKCOMPAT, it is necessary to clean
48 the compat objdirs too. The easiest way is:
49
50 rm -rf OBJDIR/compat/*/*/external/bsd/file/lib
51 rm -rf OBJDIR/compat/*/*/external/bsd/libarchive/lib
52 rm -rf OBJDIR/compat/*/*/external/public-domain/xz/lib
53
54 Changes to bsd.lib.mk to improve detecting differences in
55 shared library symbol exports may cause some .actsym files in
56 the objdir to become stale in update builds.
57
58 To work around this, delete all files matching `*.actsym' in
59 the objdir. For example:
60
61 find OBJDIR -name '*.actsym' -type f -print0 | xargs -0 rm
62
63 20241104:
64 Changes around the integration of the zstd compression
65 library may require manual deletion of some object directories
66 if you update from a build from a few days ago:
67 rm -rf DESTDIR/usr/lib/*/libarchive*
68 rm -rf DESTDIR/usr/lib/*/libmagic*
69 rm -rf DESTDIR/usr/lib/*/libzstd*
70 rm -rf DESTDIR/usr/lib/libarchive*
71 rm -rf DESTDIR/usr/lib/libmagic*
72 rm -rf DESTDIR/usr/lib/libzstd*
73 rm -rf OBJDIR/compat/*/*/external/bsd/file/
74 rm -rf OBJDIR/compat/*/*/external/bsd/libarchive/
75 rm -rf OBJDIR/compat/*/*/external/bsd/zstd/
76 rm -rf OBJDIR/external/bsd/file/
77 rm -rf OBJDIR/external/bsd/libarchive/
78 rm -rf OBJDIR/external/bsd/zstd/
79 rm -rf OBJDIR/external/gpl3/gcc/
80 rm -rf OBJDIR/tools/gcc/
81
82 20240926:
83 Building -current when running on amd64 from about 20240924
84 to about 20240926 will not work due to a "malloc_np.h"
85 error. Please downgrade to a version from 20240924 or older,
86 or upgrade to a newer version e.g. using a binary release from
87 the NetBSD build servers.
88
89 20240923:
90 Update builds will require cleaning the object directories for
91 jemalloc (like: "rm -rf $OBJ/external/bsd/jemalloc*") and the
92 libc dependency files (like: "rm $OBJ/lib/libc/jemalloc.*").
93 On architectures with COMPAT libs, those also have to be cleaned,
94 e.g. on sparc64: "rm -rf $OBJ/compat/sparc64/sparc/external/bsd/jemalloc*"
95 and "rm $OBJ/compat/sparc64/sparc/lib/libc/jemalloc.*".
96
97 20240817:
98 Update builds will require cleaning in src/external/historical/nawk/bin
99 in order to remove the awk binary since now there is a subdirectory
100 called awk.
101
102 20240812:
103 Update builds will require removing the tools objdir for gdb
104 if building with MKCROSSGDB=yes. All architectures use gdb.old
105 now.
106
107 20240630:
108 Update builds will require removing the tools objdir for binutils
109 (as most architectures should use binutils.old now).
110
111 20240610:
112 Update builds are likely to require removing the objdir for
113 distrib/<arch>/cdroms - or at least references to libarchive
114 from within there after the recent libarchive update.
115
116 20240504:
117 Update builds on x86 require making the `cleandir' target in
118 lib/libm, or deleting the objdir for lib/libm.
119
120 20240423:
121 Update builds with x11 may fail after switching to Mesa 21.
122
123 20240410:
124 Update builds may require manually deleting
125 $DESTDIR/var/run/named (and, potentially,
126 $DESTDIR/var/run/lwresd) in order to avoid checkflist failure.
127
128 20240409:
129 32-bit compatibility libraries were moved into the base32
130 and debug32 sets. HTML man pages were moved into the manhtml set.
131
132 20230828:
133 If:
134 - you updated to current and ran postinstall between 20230826
135 and 20230828 inclusive, and
136 - you are not using anything outside the base system to
137 populate /etc/openssl/certs (e.g., manually adding
138 certificates or using ca-certificates or mozilla-rootcerts or
139 mozilla-rootcerts-openssl from pkgsrc),
140 delete /etc/openssl/certs and rerun postinstall or just
141 `certctl rehash'.
142
143 Otherwise, certctl(8) will think someone else has left
144 /etc/openssl/certs in the way and will avoid clobbering it on
145 upgrade from older NetBSD.
146
147 20230718:
148 build.sh will use mk.conf in the same directory as build.sh instead
149 of /etc/mk.conf, unless MAKECONF is already defined in the environment.
150
151 20230714:
152 Import of gcc 10.5 requires a clean build of at least tools/gcc
153 and external/gpl3/gcc* object directories. An update build
154 without cleaning will result in obscure failures in rare corner
155 cases.
156
157 20230604:
158 Building native kernels with the installed make(1) instead of
159 the $TOOLDIR/bin/nbmake-${arch} wrapper will fail if userland
160 has not been updated. Note that this is an unsupported build
161 configuration (but usually works if userland is -current enough).
162
163 20230523:
164 ctfmerge was fixed as macOS host tool. This may require a clean tools
165 rebuild to detect the update to tools/compat/configure.
166
167 20230515:
168 New openssl build requires removal of the crypto/external/bsd/openssl
169 and tests/crypto/libcrypto subdirectories in the ${OBJDIR} hierarchy.
170 Otherwise test results may be wrong due to wrong "golden" output
171 files being installed.
172
173 20230322:
174 Fixes for moved /lib/libisns* mean that builds will complain about
175 ./usr/lib/libisns* being missing until src/lib/libisns is forced
176 to (re)install the files, including the symlinks. The simplest
177 way is to clean this subdir before building.
178
179 20230112:
180 New binutils require an updated ld.elf_so. If you are doing
181 (unsupported) in-place self builds (with the -E flag to build.sh),
182 make sure to have installed latest ld.elf_so before you rebuild
183 userland.
184
185 20221116:
186 The addition to NetBSD's version of UFS2 of support for extended
187 attributes broke backward compatibility with previous releases
188 of NetBSD, so UFS2 has been restored to being compatible with
189 previous NetBSD releases by disabling extended attributes.
190 (Note that ACLs are implemented as extended attributes, so
191 this changes disables ACLs as well.)
192
193 Support for UFS2 with extended attributes is now available in a new
194 UFS variant called UFS2ea. If you have created extended attributes
195 in an original UFS2 file system then "fsck -p" will now fail due to
196 the unexpected presence of extended attributes and "fsck -y" will
197 remove all extended attributes. If you wish to preserve extended
198 attributes rather than delete them, there is a utility to convert
199 a UFS2 file system to UFS2ea and leave extended attributes in place,
200 but this should be used with caution since it will preserve any
201 extended attributes that have been corrupted by the backward
202 incompatibility too.
203
204 If you wish to use a UFS2ea file system as your root file system,
205 then you will need to update your boot loader to a version that
206 supports UFS2ea.
207
208 For more information, see:
209 https://wiki.netbsd.org/features/UFS2ea
210
211 20221111:
212 The new libdrm import worsened the conflict issues for the
213 kdump/ktruss ioctl, and i915 now conflicts with base, and has
214 been turned off. This will cause update build issues like:
215
216 kdump-ioctl.c:12175:143: error: 'DRM_IOCTL_I915_DESTROY_HEAP'
217 undeclared here (not in a function);
218 did you mean 'DRM_IOCTL_MODE_DESTROY_DUMB'?
219
220 You'll need to clean usr.bin/ktruss, usr.bin/kdump, and rescue.
221
222 20220921:
223 Since the kernel version was bumped to 9.99.100, the bootloader
224 must be updated on x86 or EFI boot platforms in order to load
225 modules from boot.cfg(5) or interactively at the bootloader
226 prompt.
227
228 The kernel can still load modules at runtime, with modload(8)
229 or modules.conf(5), with no bootloader update. This will not
230 affect release branches because it only applies to patch
231 numbers >=100.
232
233 On x86 (i386 or amd64) with BIOS boot, this requires copying a
234 new /usr/mdec/boot to /boot. You can build this in the destdir
235 by running `$TOOLDIR/bin/nbmake-$ARCH dependall install' in
236 sys/arch/i386/stand.
237
238 On platforms with EFI boot (including x86 with EFI boot), this
239 requires copying a new /usr/mdec/boot*.efi to the EFI/BOOT/
240 directory on the EFI system partition. The boot*.efi file is:
241
242 aarch64 bootaa64.efi
243 amd64 bootx64.efi
244 arm bootarm.efi (32-bit arm)
245 i386 bootx32.efi
246
247 You can build this in the destdir by running
248 `$TOOLDIR/bin/nbmake-$ARCH dependall install' in
249 sys/stand/efiboot/boot*.
250
251 20220821:
252 Support for building extsrc/ has been deprecated.
253 EXTSRCSRCDIR and MKEXTSRC have been deprecated.
254
255 20220714:
256 Updates to xorg-server and associated drivers may cause builds to
257 fail. Cleaning both DESTDIR and the xorg build tree may be needed.
258
259 20220628:
260 Changes in the build of src/games/robots require a clean build
261 of that program.
262
263 20211116:
264 Changes in the xorg build require clean obj dirs for external/mit/xorg
265 (or a full clean/non-update build).
266
267 20211112:
268 Device tree sources were updated for evbarm. Some device nodes
269 (in particular, ld(4) devices on the ROCKPro64) will be renumbered.
270
271 20211014:
272 MKPIE default for aarch64 has changed, a clean build is required.
273
274 20210917:
275 Changed MNT_ACLS to default to POSIX1e ACLs instead of NFSv4
276 ACLs, to be compatible with FreeBSD. If you are using NFSv4 ACLs
277 and have "acls" in /etc/fstab you'll need to change it to "nfs4acls".
278
279 20210711:
280 Updated GMP sources may require cleaning in tools/gmp and/or in
281 external/lgpl3/gmp/lib, particularly if GCC itself does not build.
282
283 20210417:
284 GCC 10 was enabled for several platforms. If builds fail in either
285 tools/gcc or external/gpl3/gcc, first try cleaning those objects and
286 removing the $DESTDIR/usr/include/g++ subdirectory.
287
288 20201016:
289 MIPS kernel modules have been disabled until they work. This will
290 turn up in extra files in the DESTDIR, which should be cleaned.
291
292 20200925:
293 GNU MPC and MPFR have been updated. At least MPFR needs cleaning
294 in both the tools and external dirs.
295
296 20200912:
297 GCC 9 has arrived for Arm and x86 platforms, and will be coming
298 for several more, as will binutils 2.34. Clean as required.
299
300 20200907:
301 GCC 9 is coming, and binutils has been updated for MIPS. This
302 probably requires cleaning the tools/binutils.
303
304 20200811:
305 GCC updates may require cleaning the objdir. This may occur
306 due to GCC 7.5 update, GCC 8.4 move to gcc.old, or the upcoming
307 GCC 9 upgrade.
308
309 20200614:
310 blacklist* has been renamed to blocklist*. postinstall(8)
311 should handle the migration.
312
313 20200601:
314 Due to a mistake in LIBISPRIVATE handling, .so libraries were
315 created in the build directories and need cleaning.
316
317 20200311:
318 GCC 8 ports will need cleaning in src/tools/gcc and
319 src/external/gpl3/gcc due to GCC 8.4 update.
320
321 20191118:
322 More architectures were switched to gcc8:
323 i386, ia64 powerpc64, sparc, sparc64, arm
324 The same comments as in 20191022 apply.
325
326 20191112:
327 The LLVM update requires a clean rebuild for all architectures using
328 LLVM during the tools build phase (i386, amd64, aarch64).
329
330 20191022:
331 Ports amd64 and aarch64 switched to GCC 8.3 by default.
332 In-place ("expert mode", build.sh -E) builds are not supported
333 when going from a GCC 7 userland to GCC 8. Do a regular
334 build to a different DESTDIR (or preferably: build.sh -U) at least
335 once and install sets, or download comp.{tar.xz,tgz} from the
336 daily builds and install that before doing the next in-place build.
337
338 20191001:
339 GCC 8.3 was imported. Builds of src/tools/gcc may fail if
340 old builds with GCC 7 output now uses GCC 8. Clean this
341 directory, and also clean src/external/gpl3/gcc.
342
343 20190903:
344 Files with names that coincide with existing files' names on
345 case-insensitive file systems were inadvertently committed, for
346 radeon GPU firmware. We cannot mark these as obsolete for
347 postinstall to fix, so if you updated src since 2019-08-26, and
348 ran build.sh distribution or ran build.sh release, you must
349 manually delete the following files in your DESTDIR (which is
350 usually $OBJDIR/destir.$ARCH), or from / if you have installed
351 them:
352
353 /libdata/firmware/radeon/bonaire_ce.bin
354 /libdata/firmware/radeon/bonaire_mc.bin
355 /libdata/firmware/radeon/bonaire_me.bin
356 /libdata/firmware/radeon/bonaire_mec.bin
357 /libdata/firmware/radeon/bonaire_pfp.bin
358 /libdata/firmware/radeon/bonaire_rlc.bin
359 /libdata/firmware/radeon/bonaire_sdma.bin
360 /libdata/firmware/radeon/bonaire_smc.bin
361 /libdata/firmware/radeon/bonaire_uvd.bin
362 /libdata/firmware/radeon/hainan_ce.bin
363 /libdata/firmware/radeon/hainan_mc.bin
364 /libdata/firmware/radeon/hainan_me.bin
365 /libdata/firmware/radeon/hainan_pfp.bin
366 /libdata/firmware/radeon/hainan_rlc.bin
367 /libdata/firmware/radeon/hainan_smc.bin
368 /libdata/firmware/radeon/hawaii_ce.bin
369 /libdata/firmware/radeon/hawaii_mc.bin
370 /libdata/firmware/radeon/hawaii_me.bin
371 /libdata/firmware/radeon/hawaii_mec.bin
372 /libdata/firmware/radeon/hawaii_pfp.bin
373 /libdata/firmware/radeon/hawaii_rlc.bin
374 /libdata/firmware/radeon/hawaii_sdma.bin
375 /libdata/firmware/radeon/hawaii_smc.bin
376 /libdata/firmware/radeon/kabini_ce.bin
377 /libdata/firmware/radeon/kabini_me.bin
378 /libdata/firmware/radeon/kabini_mec.bin
379 /libdata/firmware/radeon/kabini_pfp.bin
380 /libdata/firmware/radeon/kabini_rlc.bin
381 /libdata/firmware/radeon/kabini_sdma.bin
382 /libdata/firmware/radeon/kaveri_ce.bin
383 /libdata/firmware/radeon/kaveri_me.bin
384 /libdata/firmware/radeon/kaveri_mec.bin
385 /libdata/firmware/radeon/kaveri_mec2.bin
386 /libdata/firmware/radeon/kaveri_pfp.bin
387 /libdata/firmware/radeon/kaveri_rlc.bin
388 /libdata/firmware/radeon/kaveri_sdma.bin
389 /libdata/firmware/radeon/mullins_ce.bin
390 /libdata/firmware/radeon/mullins_me.bin
391 /libdata/firmware/radeon/mullins_mec.bin
392 /libdata/firmware/radeon/mullins_pfp.bin
393 /libdata/firmware/radeon/mullins_rlc.bin
394 /libdata/firmware/radeon/mullins_sdma.bin
395 /libdata/firmware/radeon/oland_ce.bin
396 /libdata/firmware/radeon/oland_mc.bin
397 /libdata/firmware/radeon/oland_me.bin
398 /libdata/firmware/radeon/oland_pfp.bin
399 /libdata/firmware/radeon/oland_rlc.bin
400 /libdata/firmware/radeon/oland_smc.bin
401 /libdata/firmware/radeon/pitcairn_ce.bin
402 /libdata/firmware/radeon/pitcairn_mc.bin
403 /libdata/firmware/radeon/pitcairn_me.bin
404 /libdata/firmware/radeon/pitcairn_pfp.bin
405 /libdata/firmware/radeon/pitcairn_rlc.bin
406 /libdata/firmware/radeon/pitcairn_smc.bin
407 /libdata/firmware/radeon/tahiti_ce.bin
408 /libdata/firmware/radeon/tahiti_mc.bin
409 /libdata/firmware/radeon/tahiti_me.bin
410 /libdata/firmware/radeon/tahiti_pfp.bin
411 /libdata/firmware/radeon/tahiti_rlc.bin
412 /libdata/firmware/radeon/tahiti_smc.bin
413 /libdata/firmware/radeon/verde_ce.bin
414 /libdata/firmware/radeon/verde_mc.bin
415 /libdata/firmware/radeon/verde_me.bin
416 /libdata/firmware/radeon/verde_pfp.bin
417 /libdata/firmware/radeon/verde_rlc.bin
418 /libdata/firmware/radeon/verde_smc.bin
419
420 We will re-import these radeon firmware images another way
421 later.
422
423 20190727:
424 The uefi bootloader has gained tftp support and needs a clean
425 build. If you do update builds, manually clean its object
426 directory by something like:
427 cd sys/arch/i386/stand/efiboot && make clean
428
429 20190723:
430 The jemalloc allocator in libc is now built without extended
431 debugging (for performance reasons). In update builds make sure
432 to rebuild it completely, by removing all affected object files,
433 including compat builds, something like:
434 cd /usr/obj && find . -type d -name jemalloc|xargs rm -rf
435
436 20190207:
437 GCC 7 switched for many ports. Update builds are likely to fail.
438
439 Hints for a more successful build:
440 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
441 Use build.sh, but do not use its "expert mode":
442 This will automatically build the tools in the
443 correct order, and it will keep the tools and the
444 new build products from interfering with the running
445 system. This will allow you to ignore most of the
446 other advice in this file.
447 Build a new kernel first:
448 This makes sure that any new system calls or features
449 expected by the new userland will be present. This
450 helps to avoid critical errors when upgrading.
451 Use object directories:
452 This helps to keep stale object
453 files from polluting the build if a Makefile "forgets"
454 about one. It also makes it easier to clean up after
455 a build. It's also necessary if you want to use the
456 same source tree for multiple machines.
457 To use object directories with build.sh:
458 a) invoke build.sh with the "-M" or "-O" options.
459 To use object directories without using build.sh:
460 a) cd /usr/src ; make cleandir
461 b) Add "OBJMACHINE=yes" to /etc/mk.conf
462 c) Add "MKOBJDIRS=yes" to /etc/mk.conf
463 d) cd /usr/src ; make build
464 Note that running "make obj" in a directory will create
465 in obj.$MACHINE directory.
466 Build to a DESTDIR:
467 This helps to keep old installed files (especially libraries)
468 from interfering with the new build.
469 To build to a DESTDIR with build.sh, use the "-D" option.
470 To build to a DESTDIR without using build.sh, set the DESTDIR
471 environment variable before running make build. It should be
472 set to the pathname of an initially empty directory.
473 Problems: if you do not use build.sh, you might need to
474 update critical utilities without using DESTDIR since
475 nothing is executed from what is installed in DESTDIR.
476 (See critical utils, below.)
477 Build often:
478 This keeps critical utilities current enough to not choke
479 on any other part of the source tree that depends on up to
480 date functionality. If you use build.sh, you should not have
481 this problem.
482
483 What to do if things don't work:
484 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
485 When things don't work there are usually a few things that commonly
486 should be done.
487 1) make includes
488 This should be done automatically by make build.
489 2) cd share/mk && make install
490 Again, automatically done by make build.
491
492 Failsafe rebuild of a small part of the tree:
493 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
494 To make sure you rebuild something correctly you want to do
495 something like the following:
496 1) Make sure the includes and .mk files are up to date.
497 2) Make sure any program used to build the particular
498 utility is up to date. (yacc, lex, etc...)
499 3) cd ...path/to/util...
500 make cleandir
501 rm ...all obj directories...
502 make cleandir # yes, again
503 make obj
504 make depend && make
505
506 Failsafe rebuild of the entire tree:
507 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
508 If you really want to make sure the source tree is clean and
509 ready for a build try the following. Note that sourcing /etc/mk.conf
510 (a make(1) Makefile) in this manner is not right, and will not work
511 for anyone who uses any make(1) features in /etc/mk.conf.
512
513 ---cut here---
514 #!/bin/sh
515 . /etc/mk.conf
516
517 if [ -z $NETBSDSRCDIR ] ; then
518 NETBSDSRCDIR=/usr/src
519 fi
520 if [ \! -d $NETBSDSRCDIR ] ; then
521 echo Unable to find sources
522 exit 1
523 fi
524 find $NETBSDSRCDIR -name \*.o -o -name obj.\* -o -name obj -exec rm \{\} \;
525
526 if [ -z $BSDOBJDIR ] ; then
527 BSDOBJDIR=/usr/obj
528 fi
529 if [ -d $BSDOBJDIR ] ; then
530 rm -rf $BSDOBJDIR
531 fi
532
533 cd $NETBSDSRCDIR && make cleandir
534
535 ---cut here---
536
537 Critical utilities:
538 ^^^^^^^^^^^^^^^^^^^
539 usr.bin/make
540 usr.bin/yacc
541 usr.bin/lex
542 usr.bin/xlint
543 usr.bin/config
544
545 Other problems and possible solutions:
546 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
547 Symptom:Complaints involving a Makefile.
548 Fix: Rebuild usr.bin/make:
549 cd usr.bin/make && make && make install
550 Or, a failsafe method if that doesn't work:
551 cd usr.bin/make && cc -DMAKE_NATIVE *.c -I. -o make \
552 && install make /usr/bin
553
554 Fix: Make sure .mk files are up to date.
555 cd share/mk && make install
556
557 Symptom:Kernel `config' fails to configure any kernel, including GENERIC.
558 Fix: Rebuild usr.bin/config
559
560 Symptom:Obsolete intermediate files are used during compilation
561 Fix: Try the following sequence of commands in the directory in question.
562 make cleandir; rm `make print-objdir`; make cleandir; make obj
563 (If you built the tree without "make obj" in the past, obsolete files
564 may remain. The command tries to clean everything up)
565
566 Symptom:.../sysinst/run.c:xx: warning: initialization from incompatible
567 pointer type
568 Fix: Rebuild and install usr.bin/menuc
569
570 Symptom:mklocale not found during build in share/locale/ctype
571 Fix: Build and install usr.bin/mklocale
572
573 Symptom:undefined reference to `__assert13' or `__unsetenv13'
574 Fix: Rebuild and install lib/libc
575
576 Symptom:usr.bin/config fails to build.
577 Fix: Try building with -DMAKE_BOOTSTRAP added to CFLAGS in Makefile.
578
579 Symptom:undefined reference to `getprogname' or `setprogname'
580 Fix: Rebuild and install lib/libc
581
582 Symptom:Update build fails in src/tools/gcc complaining that a variable
583 (e.g. CPPFLAGS) has changed since the previous run.
584 Fix: Run "nbmake-${ARCH} clean" in src/tools/gcc or do a clean build.
585
586 Symptom:cvs [update aborted]: cannot open directory /cvsroot/src/...:
587 No such file or directory.
588 Cause: If a directory is created by mistake, then it is sometimes
589 deleted from the CVS repository using administrative commands
590 that bypass the normal cvs access controls. If your cvs working tree
591 contains references to a directory that has been deleted on the
592 server in this way, then "cvs update" reports this error.
593 Fix: Recursively delete the affected directory from your working tree
594 and try the update again.
595