From owner-freebsd-hackers@freebsd.org  Mon Nov 30 11:39:47 2015
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Date: Mon, 30 Nov 2015 17:37:12 +0600
From: Alexnader Kuleshov <kuleshovmail@gmail.com>
To: freebsd-hackers@freebsd.org
Subject: Build only changes
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Hello All,

I'm new in FreeBSD, so my question can be stupid, but I have just executed
`make buildworld` and it was successful. Now I want to do some little changes
for example in one of `usr.sbin` application. How can I recompile only changed
application? If I'm executing `make buildworld` again, I see that there is
new long-long-time compilation of the full base.

I've started to look into the base's Makefiles and tried to execute:

make buildworld -j4 -DMK_CDDL=no -DMK_KERBEROS=no -DMK_RESCUE=no -DMK_CRYPT=no
-DMK_TEST=no -DNO_CLEAN=yes -DMK_CLANG_BOOTSTRAP=no -DMK_CLANG=no

but anyway I see that contrib/llvm/tools/clang/* is compiling.

Is there ability to compile only one separate dir in the FreeBSD base?

Thank you.