FreeBSD Source:

This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$

For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information).

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables.

The buildkernel and installkernel targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags.

Building a kernel is a somewhat more involved process. See build(7), config(8), and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information.

Note: If you want to build and install the kernel with the buildkernel and installkernel targets, you might need to build world before. More information is available in the handbook.

The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used.

Source Roadmap:

bin     System/user commands.

cddl        Various commands and libraries under the Common Development
        and Distribution License.

contrib     Packages contributed by 3rd parties.

crypto      Cryptography stuff (see crypto/README).

etc     Template files for /etc.

gnu     Various commands and libraries under the GNU Public License.
        Please see gnu/COPYING* for more information.

include     System include files.

kerberos5   Kerberos5 (Heimdal) package.

lib     System libraries.

libexec     System daemons.

release     Release building Makefile & associated tools.

rescue      Build system for statically linked /rescue utilities.

sbin        System commands.

secure      Cryptographic libraries and commands.

share       Shared resources.

stand       Boot loader sources.

sys     Kernel sources.

tests       Regression tests which can be run by Kyua.  See tests/README
        for additional information.

tools       Utilities for regression testing and miscellaneous tasks.

usr.bin     User commands.

usr.sbin    System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:

https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html