 @@ -1,719 +1,727 @@
-$NetBSD: UPDATING,v 1.263 2015/09/19 18:31:41 dholland Exp $
+$NetBSD: UPDATING,v 1.264 2016/01/25 09:24:29 martin Exp $
 This file (UPDATING) is intended to be a brief reference to recent
 changes that might cause problems in the build process, and a guide for
 what to do if something doesn't work.
 For a more detailed description of the recommended way to build NetBSD
 using build.sh, see the BUILDING file.
 Note that much of the advice in this UPDATING file was written before
 build.sh existed.  Nevertheless, the advice here may be useful for
 working around specific problems with build.sh.
 Sections are marked with "^^^^^".  After the section on "Recent changes"
 are several sections containing more general information.
 See also: BUILDING, build.sh, Makefile.
 Recent changes:
 ^^^^^^^^^^^^^^^
 20160125:
 	Dtrace has been enabled by default on some architectures.
 	When doing an update build, make sure to clean the etc/mtree
 	object directory before starting the build - otherwise the
 	needed directories in destdir will not be created.
 	An easy way to do this is:
 	   cd src/etc/mtree && $TOOLDIR/bin/nbmake-$arch cleandir
 20150818:
 	New acpica requires "make cleandir" in src/external/bsd/acpica
 	again.
 20150413:
 	New acpica requires "make cleandir" and reinstalling yacc
 	in /usr/src/external/bsd/byacc and /usr/src/tools/yacc and
 	also "make cleandir" in /usr/src/external/bsd/acpica.
 20150404:
 	Lint changes require a full rebuild of the tool, so make
 	sure to build without -u option to build.sh, or manually
 	do a make cleandir in src/tools/lint1 and
 	src/usr.bin/xlint.
 20150310:
 	Improvements to openssl for arm mean that update builds of
 	the openssl libraries will fail. A make cleandir in
 	external/bsd/openssl/lib is needed
 20141026:
 	A mishap during the import of pppd may cause your corruption
 	in your cvs directory if you happened to do a cvs update
 	during a short period of time. To fix, just remove the
 	directory src/external/bsd/ppp/dist/pppd completely
 	and let cvs restore it on next update.
 20140721:
 	The src/external/mit/lua/src directory was accidentally created
 	and then deleted in the CVS repository.  If you get errors like
 	cvs [update aborted]: cannot open directory
 	/cvsroot/src/external/mit/lua/src: No such file or directory
 	then delete your local copy of that directory tree and try again.
 20140530:
 	ARM eABI switched to DWARF based exception handling. This requires
 	rebuilding all C++ code. It is strongly advised to do a clean build.
 20140131:
 	The new compiler_rt/libc integration moved a few things. It is strongly
 	advised to do a clean build. At least lib/libc, the compat version(s)
 	of libc, libkern, rump and the kernels need to be cleaned.
 20131227:
 . The new ntpd runs in a restricted mode to prevent amplification
 	   attacks. If you need ntpdc to work you need to explicitly enable
 	   mode7 in your config file. Make sure you put the necessary restrict
 	   statements to avoid being exposed.
 . strncat has moved from lib/libc to common/lib/libc; you might need
 	   to make clean in libc
 20131129:
 	The GMP sources were updated, and builds will likely fail without
 	cleaning their build trees for both tools and in-tree, like below.
 20131128:
 	The MPC and MPFR sources were updated, and builds may require their
 	tools and in-tree directories cleaned for successful updates.
 20130605:
 	The kernel option FAST_IPSEC no longer exists, it's been renamed
 	to IPSEC (and the older IPSEC version removed).
 20130605:
 	Previous freetype installations eroneously installed private
 	header files. If you are building against a non-empty $DESTDIR,
 	please remove ${DESTDIR}//usr/X11R7/include/freetype2/freetype/.
 20130531:
 	The xdm update may cause build failure due to xdm.man being
 	in the obj tree.  Make sure to ensure any like this:
 		nbmake: nbmake: don't know how to make xdm.man. Stop
 	is fixed by deleting the xdm.man in the obj tree.
 20130530:
 	Updates of many xsrc packages will leave old .pc files around.
 	Best to clean out the xsrc objdir entirely before rebuilds.
 20130301:
 	The removal of netiso requires manual removal of /usr/include/netiso
 	prior to the build and make cleandir in /usr/src/usr.bin/{ktruss,kdump}
 20120726:
 	The update of OpenSSL requires cleaning both the OpenSSL build
 	directory and DESTDIR.  *Even non-update builds require cleaning
 	DESTDIR.* Builds done without taking these steps may fail, or in
 	some cases may succeed and install broken OpenSSL libraries that
 	cause third-party software to link incorrectly and/or crash.
 20120507:
 	The database schema for makemandb was changed.  You will
 	need to update the database using 'makemandb -f' or wait
 	for the next weekly run to fix it.
 20120319:
 	sys/conf/Makefile.kern.inc has been modified to adjust the
 	size of db_symtab automatically.  You need to update dbsym in
 	your $TOOLDIR to build kernels with options SYMTAB_SPACE.  If
 	you don't want this behavior, add AUTO_SYMTAB_SPACE=no to your
 	mk.conf.
 20120216:
 	Default for MKCATPAGES changed to NO.  Update builds will fail
 	unless DESTDIR is cleaned manually.  If you built between 20120207
 	and 20120216, daily and weekly could have created an unreadable
 	/var/db/man.db index for apropos.  Running makemandb -f or
 	the next run of weekly will fix it.
 20111227:
 	If you built between 20111225 and 20111227 you need to remove
 	/usr/lib/libpam.so.4* and /usr/lib/security/*.so.4, since the
 	bump has been reverted.
 20111125:
 	The "rnd" pseudodevice has been added to sys/conf/std, which
 	means it should no longer be explicitly listed in kernel
 	configuration files.  The line "pseudo-device rnd" should be
 	removed from any custom kernel config files users may have.
 20111119:
 	A problem with the datastructures used by the rndctl(8)
 	utility (pointers in datastructures in an array, making 32->64
 	bit compatibility very painful) has been fixed in a
 	non-backwards-compatible way.  If you replace your kernel,
 	replace your rndctl executable too.
 20111001:
 	the prop_*_send_syscall() functions from proplib(3) have been
 	changed and their new version is not backward compatible with the old
 	one.  So ensure that all consumers of these functions (currently:
 	quota2 code and its tests) are updated together with the new lib.
 20110817:
 	sparc has been changed to use GCC 4.5.3, so any objdir or
 	DESTDIR for them should be deleted before updating.
 20110806:
 	i386 and amd64 have been changed to use GCC 4.5.3, so any
 	objdir or DESTDIR for them should be deleted before updating.
 20110805:
 	The update to GCC 4.5.3 requires a non-trivial portion of
 	the tree to be cleaned.  Best to delete both objdir and
 	DESTDIR before running this update.  So far, only the
 	sparc64, mips and powerpc platforms have changed.
 20110803:
 	The layout of external/public-domain/xz has changed.  To do an
 	update build you will have to remove the contents of the OBJDIR
 	for external/public-domain/xz/bin by hand as the xz entry there
 	is now a directory.
 20110410:
 	The configuration of src/tools/gcc has changed.  To do an
 	update build you have to clean both tools/binutils and
 	tools/gcc by hand.
 20110328:
 	Building the Xorg binary was moved into a subdirectory to fix
 	ordering issues with "make all".  It may be necessary to remove
 	the OBJDIR for external/mit/xorg/server/xorg-server/hw/xfree86
 	if your update build fails, as the "Xorg" entry there is now a
 	directory.
 20110121:
 	Assembler files no longer use -traditional-cpp.  This can break
 	the build of individual parts of the tree.  This is handled
 	correctly by build.sh.  Manual builds have to update /usr/share/mk
 	and re-run config(1) for any kernel configurations as needed.
 20101217:
 	The tcpdump(8) program was changed to drop privileges and chroot(2)
 	by default.  It may be necessary to manually update passwd(5) and
 	group(5) in order to make the program work with existing setups.
 20101125:
 	The latest changes to setenv(3) dissallow setting environment
 	variables with names that contain '='.  Revision 1.18 of env.c
 	assumed that this was allowed.  Installing a new libc with an
 	old copy of /usr/bin/env causes env x=1 printenv | grep x= to
 	break which affects the autoconf tests for dependency finding,
 	so building gcc will end up printing:
 	    checking dependency style of gcc... none
 	    configure: error: no usable dependency style found
 	Fix it by rebuilding and re-installing env.
 20101119:
 	Recent Xorg updates in xsrc/external/mit/ may cause various build
 	or run-time problems.  Delete your entire DESTDIR and OBJDIR if you
 	have any build problems with xsrc, or problems with mismatched
 	versions between xorg-server and drivers.
 20100604:
 	The update of ATF to 0.9 causes old tests written in shell to fail
 	unless they are rebuilt.  If you are building with MKUPDATE=yes,
 	you need to clean the src/external/bsd/atf/tests/ and the src/tests/
 	trees by hand.
 20100522:
 	Recent Xorg updates in xsrc/external/mit/ will cause various build
 	problems.  Delete your entire DESTDIR and OBJDIR if you have any
 	build problems with xsrc.
 20100522:
 	private section of <ctype.h> was splitted, and now mklocale(1)
 	include ctype_local.h, so you have to make cleandir in tools/mklocale.
 20100520:
 	The location of the xkb compiled descriptions has changed.  Please
 	remove usr/X11R7/lib/X11/xkb/compiled from your $DESTDIR.
 20100222:
 	The shared objects file extension has been changed from .so to
 	.pico, in order to avoid conflicts with shared libraries names
 	libXX.so.  All now stale regular .so files can be removed from
 	your object directories.
 20100204:
 	The termcap database has been removed from the sources,
 	but has not been marked obsolete so it is not removed
 	from the system when upgrading.
 	As such, you will need to remove them from your object
 	and destination directories.
 20091101:
         After updating, it may be necessary to make the 'cleandir'
         target in src/tools/yacc/ and in src/usr.bin/yacc/ before a
         'build.sh -u tools' or 'build.sh -u distribution'.  Ditto
         src/tools/lex/ and src/usr.bin/lex/.
 20091001:
 	On amd64 you must rebuild tools (to get the new binutils)
 	before building a kernel, or the build fails on cpufunc.S.
 20091001:
 	An error will create a ./usr/X11R7/lib/X11/xkb/compiled/xkb
 	symlink, failing the build.  Delete the link, and the subdir
 	it is in, and retry your build.
 20090718:
 	libc build changed so that strchr() provides the extra entry
 	point for index().  Update build of libc.a (and libc_pic.a)
 	may fail because the archive contains the unwanted index.o.
 	(Similarly for strrchr() and rindex().)
 20090709:
 	Native Xorg was upgraded again.  Builds will probably fail again
 	without a clean objdir, at least for src/external/mit/xorg.
 20090616:
 	Native Xorg was upgraded.  Builds will need a clean objdir for
 	src/external/mit/xorg.  Upgrading a system from sets will not
 	work properly yet as the /usr/X11R7/lib/X11/xkb/symbols/pc
 	subdirectory has been changed into a file, and this needs to
 	be manually "rm -r"'ed before installing xbase.tgz.
 20090501:
 	Several new functions were added to string.h/libc, and this
 	can cause autoconf problems during the tool build for people
 	who fail to clean out their tools objects properly.  If you
 	note messages about stpcpy, stpncpy or strnlen accompanying a
 	failure during the tool build, clean out all your tools
 	objects and start again.
 20090325:
 	The i386 port was switched to i486 default toolchain.  This requires
 	cleaning your src/tools directory and $TOOLDIR and rebuilding them.
 20090126:
 	The __posix_fadvise50 system call changed assembly stub type.  You
 	need to 'rm -f __posix_fadvise50.*' in the libc build directory
 	to avoid using the old assembly stub.
 20090202:
 	pkg_install now depends on the pkgdb cache for automatic conflict
 	detection.  It is recommented to rebuild the cache with
 	``pkg_admin rebuild''.
 20090110:
 	time_t and dev_t have been bumped to 64 bit quantities.  To upgrade:
 . Make sure your kernel has COMPAT_50 in it.  Build and install.
 	   This is needed even in the MODULAR kernel because there is
 	   conditionally compiled code in rtsock.c.
 . make sure build.sh completes and the binaries in a chroot work
 	   before installing.
 . If you don't use build.sh and you build directly to root, and
 	   your build breaks in the middle, don't despair.  Make sure headers
 	   are installed properly, and start building libraries first libc
 	   and libutil, install them and then continue building all the
 	   libraries in src/lib and src/gnu/lib and install them.  Once
 	   the new libraries are installed, you can restart the build.
 . If you compile packages and you notice link time warnings,
 	   rebuild the required packages to update their shared libraries.
 	   Any package you rebuild will require rebuilding all the packages
 	   that depend on it.
 . Next time you run pwd_mkdb with the new binary, the file
 	   will be upgraded and it will not be backwards compatible.
 . The utmpx/wtmpx files (/var/run/utmpx and /var/log/wtmpx, see
 	   lastlogx(5)) have been versioned, and there is a heuristic
 	   for utmp.  You are better off removing the old files after
 	   upgrading.  The automated clearing of /var/run during
 	   boot, and the automated rotating of files in /var/log by
 	   newsyslog(8), may mean that you do not have to remove the
 	   files manually.
 . The optional accounting file (/var/account/acct, see
 	   accton(8)) has not been versioned, and will need to be
 	   removed.  The automatic rotation of the accounting file by
 	   /etc/daily limits the bad consequences of failure to remove
 	   the file.
 . Application software that writes time_t to binary files on
 	   disk will break or need attention.  Most notably: if you are
 	   using PostgreSQL < 8.4, you need to dump your databases,
 	   rebuild PostgreSQL with the new time_t, then restore.
 20081219:
 	config(1) has been updated, and one of the files it creates -
 	swapnetbsd.o - has changed format.  You need to rebuild config
 	(done automatically by build.sh) and then you need to rerun
 	config on all kernel configuration files before rebuilding those
 	kernels.
 20081205:
 	If you build with MKX11=no, you should remove /etc/rc.d/xdm and
 	/etc/rc.d/xfs from DESTDIR because those files were moved to the xetc
 	set and will appear as extra files for MKX11=no update builds.
 20081122:
 	On i386, various kernel options(4) in GENERIC including
 	file systems have been disabled and moved into kernel modules.
 	Before trying a new GENERIC kernel, you have to prepare the
 	following files as well as a new GENERIC kernel:
 	- build and install kernel modules from src/sys/modules
 	- install the latest bootloader, which will load a module
 	  for the file system from which the kernel is loaded automatically
 	If you have to load your kernel from a file system which is not of
 	the same type as the root file system, you have to load the necessary
 	file system module manually on the boot prompt or in the boot.cfg file.
 20080827:
 	If you built and installed a libc from sources between
 /08/20 and 2008/08/26 you got a broken strtouq(3)
 	which results in false errors reported by lint(1).
 	Since this breaks the libc build itself, manual help is
 	needed -- lint must be disabled temporarily, e.g.:
 	  $ (cd lib/libc && make MKLINT=no dependall install)
 20080813:
 	MKDEBUG build was broken because the .depend files did not know
 	about .go files.  You need to remove all .depend files and rebuild.
 20080802:
 	A regression in binary compatibility for pthread_mutex_t has
 	been fixed.  Unfortunately, the price is breaking compatibility
 	for -current.
 	Threaded programs (using libpthread) and C++ programs (using
 	libstdc++) compiled after 20070907 and before 20080802 need to
 	be recompiled.
 	One way to find affected pkgsrc packages:
 	  $ grep REQUIRES=/usr/lib/libpthread /var/db/pkg/*/+BUILD_INFO
 	  $ grep REQUIRES=/usr/lib/libstdc++ /var/db/pkg/*/+BUILD_INFO
 20080731:
 	WAPBL (metadata journaling support) has been added, but at this
 	time isn't backwards compatible with pre-WAPBL aware kernels
 	and userland (fsck_ffs in particular).  Please make sure you
 	don't use a journaled filesystem with an older kernel/userland,
 	especially an uncleanly mounted journaled filesystem.  WAPBL
 	also requires the super block to be in the UFS2 format.  You
 	can use fsck_ffs -c 4 to update the superblock format.
 20080721:
 	Assembler warnings are now fatal if $WARNS>0 and $NOGCCERROR
 	isn't defined.
 20080531:
 	The ioctl number of DRVSUSPENDDEV command on /dev/drvctl changed
 	from 125 (conflicted with DRVCTLCOMMAND) to 129.  The drvctl(8)
 	utility needs to be rebuilt and reinstalled as older binaries
 	won't work correctly.  The following sequence of commands:
 	  $ (cd sys/sys/ && nbmake-$arch includes)
 	  $ (cd sbin/drvctl/ && nbmake-$arch clean)
 	  $ (cd sbin/drvctl/ && nbmake-$arch all)
 	leaves new drvctl utility in sbin/drvctl build directory.
 20080503:
 	The <bsd.lib.mk> variable MKPRIVATELIB was renamed to LIBISPRIVATE.
 20080521:
 	For a while, unprivileged UPDATE builds would fail to
 	succeed at the checkflist stage, complaining that
 	${DESTDIR}/stand/<arch>/ did not exist.  A fix for this
 	problem was committed to share/mk/bsd.kmodule.mk, revision 1.9.
 	If you already hit this problem, update the .mk file,
 	remove ${DESTDIR}/stand/<arch>, and re-run the build.
 20080303:
 	Linker warnings are now fatal if $WARNS>0.
 20080126:
 	The posix_fadvise system call has been changed from an assembly
 	stub, to a c file that calls an assembly stub.  You need to
 	'rm -f posix_fadvise.* .depend' in the libc build directory to
 	avoid using the old assembly stub.
 20071209:
 	The acpiec(4) driver has been split into two attachments.  If you
 	get ACPI errors before the attachment, please update your kernel
 	configuration file appropriately or see GENERIC for more details.
 20071115:
 	The it(4) driver has been renamed to itesio(4) and the old port
 	argument specified in the kernel configuration file is not valid
 	anymore.  The itesio(4) driver now uses the Super I/O address port
 	rather than the EC address port.  Please update your kernel
 	configuration file appropriately or see GENERIC for more details.
 20071028:
 	The pccons(4) driver has been removed from the NetBSD/shark port.
 	You need to update any custom kernel configuration file you have
 	to remove any references to pccons (which includes removing the
 	now useless XSERVER option) and replace them with the correct
 	entries for the wscons driver.  See the GENERIC configuration file
 	for more details.
 20070913:
 	A latent bug in dhclient/dhcpd that caused it to be unable to
 	enumerate interfaces was fixed.  The bug began to cause
 	problems after 20070911 when the kernel's SIOCGIFCONF
 	implementation was repaired.  From 20070529 to 20070911 racoon
 	could not enumerate interfaces.  (These are noted because
 	normal kernel/userspace version matching hygiene is not
 	sufficient to avoid this problem.)  Ensure that both kernel
 	and userland are from after 20070913.
 20070703:
 	nbinstall has been renamed ${MACHINE_GNU_ARCH}-install.  It
 	calls the target-specific strip program, and the logic to pass
 	down STRIP from make has been removed.  This requires a
 	re-installation of tools.
 20070422:
 	The way OS emulations lookup filenames inside the emulation root
 	has been changed.  Rather than modify the pathname (and copy back
 	to userspace) namei() and lookup() directly check the emulation
 	root.  One side effect is that absolute symlinks inside the emulated
 	root file system will be relative to that file system - unless they
 	start /../ this is useful when the emulated root is a real install
 	that has such links.
 	This might affect symlinks that have been added to reference outside
 	the emulated root.
 20070412:
 	The pckbc driver on sgimips IP32 has been removed.  Use macekbc
 	instead.  See the GENERIC32_IP3x kernel configuration for an
 	example.
 20070319:
         src/lib/libc/Makefile revision 1.129 broke libc and ld.elf_so
         on many platforms due to incorrect flags settings.  If you
         updated and built after about 20070315, do "nbmake-$arch
 	cleandir" in src/lib/libc and src/libexec/ld.elf_so to force a
 	rebuild of object files that might have been built
 	incorrectly, and ensure that you have at least
 	src/lib/libc/Makefile 1.130.
 20070210:
         src/sys/sys/{sa.h,savar.h} were removed.
           find ${OBJDIR} \( -name .depend -o -name '*.d' \) -print \
               | xargs egrep -l '/sa.h|/savar.h' | xargs rm
         will allow dependencies on those files to get get rebuilt
 20070209:
         The threading model was changed when the newlock2 branch
         was merged to NetBSD-current.  If you boot with a new
         kernel (version 4.99.10), then you also need a new pthread
         library (/usr/lib/libpthread.so.0.7).  If you boot with
         an old kernel, then you need the old pthread library
         (/usr/lib/libpthread.so.0.6).  Provided you keep the kernel and
         the pthread library in sync, old threaded applications should
         continue to work with an old or new kernel.  Note that named(8)
 	is the only threaded application in the base system.
 20061214:
 	Following the move of string_to_flags() and flags_to_string()
 	from the bin/ls/ sources to libutil, users doing UPDATE builds
 	will need to do a "make cleandir" in
 		tools/mtree/, tools/makefs/, tools/binstall/, tools/pax/,
 		bin/pax/, bin/ls/, usr.sbin/mtree/, usr.sbin/makefs/,
 		usr.bin/xinstall/, libexec/ftpd/, rescue/, as well
 		as the installation images in distrib/
 	in order to excise stale references to the old stat_flags.h header
 	file in the ls sources -- stat_flags.h has been removed.
 20061108:
 	The configure script used in the src/tools/gcc compiler has been
 	changed to indicate that our libc has ssp support built-in and
 	does not depend on -lssp and -lssp-nonshared.  You'll need to
 	make clean in src/tools/gcc first to rebuild the compiler.
 20061009:
 	The sysctl variables net.inet{,6}.tcp{,6}.newreno are no longer
 	available.  Use net.inet{,6}.tcp{,6}.congctl.selected instead.
 20060814:
 	The vt, vidcconsole, kbd, and rpckbd drivers on acorn32 have been
 	withdrawn.  Use vidcvideo and pckbd instead.  See the GENERIC
 	kernel configuration for an example.  X servers from the last
 	few years should cope.
 20060703:
 	MPACPI is no more.  We always configure PCI interrupts using ACPI
 	if we have an ACPI kernel.  The option MPACPI_SCANPCI has been renamed
 	to ACPI_SCANPCI.  Thanks to work from fvdl.
 20060627:
 	socket(2) has changed, and its system call has been versioned.
 	For userlands with the old version of socket(2), make sure that
 	your kernel has 'options COMPAT_30' set, or else 'bad system call'
 	errors will result.
 Hints for a more successful build:
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     Use build.sh, but do not use its "expert mode":
 	This will automatically build the tools in the
 	   correct order, and it will keep the tools and the
 	   new build products from interfering with the running
 	   system.  This will allow you to ignore most of the
 	   other advice in this file.
     Build a new kernel first:
 	This makes sure that any new system calls or features
 	   expected by the new userland will be present.  This
 	   helps to avoid critical errors when upgrading.
     Use object directories:
 	This helps to keep stale object
 	   files from polluting the build if a Makefile "forgets"
 	   about one.  It also makes it easier to clean up after
 	   a build.  It's also necessary if you want to use the
 	   same source tree for multiple machines.
 	   To use object directories with build.sh:
 	    a) invoke build.sh with the "-M" or "-O" options.
 	   To use object directories without using build.sh:
 	    a) cd /usr/src ; make cleandir
 	    b) Add "OBJMACHINE=yes" to /etc/mk.conf
 	    c) Add "MKOBJDIRS=yes" to /etc/mk.conf
 	    d) cd /usr/src ; make build
 	   Note that running "make obj" in a directory will create
 	   in obj.$MACHINE directory.
     Build to a DESTDIR:
 	This helps to keep old installed files (especially libraries)
 	   from interfering with the new build.
 	   To build to a DESTDIR with build.sh, use the "-D" option.
 	   To build to a DESTDIR without using build.sh, set the DESTDIR
 	   environment variable before running make build.  It should be
 	   set to the pathname of an initially empty directory.
 	   Problems: if you do not use build.sh, you might need to
 		update critical utilities without using DESTDIR since
 		nothing is executed from what is installed in DESTDIR.
 		(See critical utils, below.)
     Build often:
 	This keeps critical utilities current enough to not choke
 	on any other part of the source tree that depends on up to
 	date functionality.  If you use build.sh, you should not have
 	this problem.
 What to do if things don't work:
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 When things don't work there are usually a few things that commonly
 should be done.
 )	make includes
 	This should be done automatically by make build.
 )  cd share/mk && make install
 	Again, automatically done by make build.
 Failsafe rebuild of a small part of the tree:
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 To make sure you rebuild something correctly you want to do
 something like the following:
 )  Make sure the includes and .mk files are up to date.
 )  Make sure any program used to build the particular
 	utility is up to date.  (yacc, lex, etc...)
 )  cd ...path/to/util...
 	make cleandir
 	rm ...all obj directories...
 	make cleandir			# yes, again
 	make obj
 	make depend && make
 Failsafe rebuild of the entire tree:
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 If you really want to make sure the source tree is clean and
 ready for a build try the following.  Note that sourcing /etc/mk.conf
 (a make(1) Makefile) in this manner is not right, and will not work
 for anyone who uses any make(1) features in /etc/mk.conf.
 ---cut here---
 #!/bin/sh
 . /etc/mk.conf
 if [ -z $NETBSDSRCDIR ] ; then
     NETBSDSRCDIR=/usr/src
 fi
 if [ \! -d $NETBSDSRCDIR ] ; then
     echo Unable to find sources
     exit 1
 fi
 find $NETBSDSRCDIR -name \*.o -o -name obj.\* -o -name obj -exec rm \{\} \;
 if [ -z $BSDOBJDIR ] ; then
     BSDOBJDIR=/usr/obj
 fi
 if [ -d $BSDOBJDIR ] ; then
     rm -rf $BSDOBJDIR
 fi
 cd $NETBSDSRCDIR && make cleandir
 ---cut here---
 Critical utilities:
 ^^^^^^^^^^^^^^^^^^^
 	usr.bin/compile_et
 	usr.bin/make
 	usr.bin/yacc
 	usr.bin/lex
 	usr.bin/xlint
 	usr.bin/config
 Other problems and possible solutions:
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 Symptom:Complaints involving a Makefile.
 Fix:	Rebuild usr.bin/make:
 	cd usr.bin/make && make && make install
 	Or, a failsafe method if that doesn't work:
 	cd usr.bin/make && cc *.c */*.c -I . -o make && mv make /usr/bin
 Fix:	Make sure .mk files are up to date.
 	cd share/mk && make install
 Symptom:Kernel `config' fails to configure any kernel, including GENERIC.
 Fix:	Rebuild usr.bin/config
 Symptom:
 Fix:	Rebuild usr.bin/yacc
 Symptom:
 Fix:	Rebuild usr.bin/lex
 Symptom:
 Fix:	rm /usr/lib/libbfd.a
 Symptom:Obsolete intermediate files are used during compilation
 Fix:	Try the following sequence of commands in the directory in question.
 	make cleandir; rm `make print-objdir`; make cleandir; make obj
 	(If you built the tree without "make obj" in the past, obsolete files
 	may remain.  The command tries to clean everything up)
 Symptom:.../sysinst/run.c:xx: warning: initialization from incompatible
 	pointer type
 Fix:	Rebuild and install usr.bin/menuc
 Symptom:mklocale not found during build in share/locale/ctype
 Fix:	Build and install usr.bin/mklocale
 Symptom:undefined reference to `__assert13' or `__unsetenv13'
 Fix:    Rebuild and install lib/libc
 Symptom:usr.bin/config fails to build.
 Fix:	Try building with -DMAKE_BOOTSTRAP added to CFLAGS in Makefile.
 Symptom:undefined reference to `getprogname' or `setprogname'
 Fix:    Rebuild and install lib/libc
 Symptom:lint does not understand the '-X' option
 Fix:    May need to build & install libs with NOLINT=1 before rebuilding lint
 Symptom:Update build fails in src/tools/gcc complaining that a variable
 	(e.g. CPPFLAGS) has changed since the previous run.
 Fix:    Run "nbmake-${ARCH} clean" in src/tools/gcc or do a clean build.
 Symptom:cvs [update aborted]: cannot open directory /cvsroot/src/...:
 	No such file or directory.
 Cause:	If a directory is created by mistake, then it is sometimes
 	deleted from the CVS repository using administrative commands
 	that bypass the normal cvs access controls.  If your cvs working tree
 	contains references to a directory that has been deleted on the
 	server in this way, then "cvs update" reports this error.
 Fix:	Recursively delete the affected directory from your working tree
 	and try the update again.