BUILD(7)

NAME

     build -- information on how to build the system

DESCRIPTION

     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
     install the things in that directory.  Issuing the make(1) command in any
     directory or subdirectory of those directories has the same effect as
     issuing the same command in all subdirectories of that directory.	With
     no target specified, the things in that directory are just built.	The
     following 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.

     buildkernel
		 Rebuild the kernel and the kernel modules.

     installkernel
		 Install the kernel and the kernel modules.

     reinstallkernel
		 Reinstall the kernel and the kernel modules.

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

ENVIRONMENT

     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
		  installed.

FILES

     /etc/make.conf
     /usr/doc/Makefile
     /usr/doc/share/mk/doc.project.mk
     /usr/ports/Mk/bsd.port.mk
     /usr/ports/Mk/bsd.sites.mk
     /usr/share/examples/etc/make.conf
     /usr/src/Makefile
     /usr/src/Makefile.inc1

EXAMPLES

     For an ``approved'' method of updating your system from the latest
     sources, please see the COMMON ITEMS section in src/UPDATING.

     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

SEE ALSO

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

AUTHORS

     Mike W. Meyer <mwm@mired.org>.