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BUILD(7)	     BSD Miscellaneous Information Manual	      BUILD(7)

     build -- information on how to build the system

     The source	for the	FreeBSD	system and applications	are contained in three
     different directories, normally /usr/src, /usr/doc, and /usr/ports.
     /usr/src contains the "base system" sources, which	is loosely defined as
     the things	required to rebuild the	system to a useful state.  /usr/doc
     contains the source for the system	documentation, excluding the manual
     pages.  /usr/ports	is a tree that provides	a consistent interface for
     building and installing third party applications.

     The make(1) command is used in each of these directories to build and in-
     stall the things in that directory. Issuing the make command in any di-
     rectory or	subdirectory of	those directories has the same effect as issu-
     ing the same command in all subdirectories	of that	directory. With	no
     target specified, the things in that directory are	just built. The	fol-
     lowing list provides the names and	actions	for other targets:

     clean	   Removes any files created during the	build process.

     install	   Installs the	results	of the build for this directory.

     update	   Gets	updated	sources	as configured in /etc/make.conf.

     The other /usr/src	make targets are:

     buildworld	   Rebuild everything but the kernel, configure	files in /etc,
		   and release.

     installworld  Install everything built by "buildworld".

     world	   buildworld +	installworld.

     buildkernel   Rebuild the kernel and the kernel-modules.

		   Install the kernel and the kernel-modules.

		   Reinstall the kernel	and the	kernel-modules.

     upgrade	   Upgrade a.out (2.2.x/3.0) system to the new ELF way

     most	   Build user commands,	no libraries or	include	files.

     installmost   Install user	commands, no libraries or include files.

     aout-to-elf   Upgrade an system from a.out	to elf format.

		   Build everything required to	upgrade	a system from a.out to
		   elf format.

		   Install everything built by aout-to-elf-build.

		   Move	the a.out libraries into an aout sub-directory of each
		   elf library sub-directory.

     For more information about	the ports build	process, see ports(7).

     TARGET_ARCH  The target machine processor architecture.  This is analo-
		  gous to the "uname -p" output.  Set this to cross-build for
		  a different architecture.

     TARGET	  The target hardware platform.	 This is analogous to the
		  "uname -m" output.  This is necessary	to cross-build some
		  target architectures.	 For example, cross-building for PC98
		  machines requires TARGET_ARCH=i386 and TARGET=pc98.

     NO_WERROR	  If defined, warnings will not	cause the build	to halt, even
		  if the makefile says otherwise.

     DESTDIR	  The directory	hierarchy where	the resulting binaries will be


     The "approved" method of updating your system from	the latest sources is:

	   make	buildworld
	   make	buildkernel KERNCONF=FOO
	   make	installkernel KERNCONF=FOO
	   make	installworld

     "FOO" must	be replaced with the name of the kernel	configuration file
     from which	the kernel should be built.  Alternatively, the	KERNCONF vari-
     able in /etc/make.conf can	be set to the name of the kernel to build; in
     this case the "KERNCONF=FOO" part of the "buildkernel" and
     "installkernel" commands can be omitted.

     After running these commands a system reboot is required, otherwise many
     programs which have been rebuilt (such as ps, top,	etc) may not work with
     the old kernel which is still running.

     The following sequence of commands	can be used to cross-build the system
     for the Alpha architecture	on an i386 host:

	   cd /usr/src
	   make	TARGET_ARCH=alpha buildworld
	   make	TARGET_ARCH=alpha DESTDIR=/clients/axp installworld

     cc(1), install(1),	make(1), make.conf(5), ports(7), release(7),
     mergemaster(8), reboot(8),	shutdown(8)

     Mike W. Meyer <>.

BSD			       November	4, 2000				   BSD


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