958dc017a7
This can cause surprising errors if the build tools is built against headers that don't match the host system. It is also required in order to allow building on non-FreeBSD systems where the headers in /usr/include/sys are usually completely incompatible with those in the source tree. I added an error to Makefile.boot if this is done and found this was only the case in libnv. With this error in the Makefile ABI breakages such as r336019 should no longer be possible. Reviewed By: bdrewery, kevans Approved By: jhb (mentor) Differential Revision: https://reviews.freebsd.org/D16186
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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.
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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.
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used in release builds. NOTES contains documentation of
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usr.bin User commands.
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