[Bug 224847] graphics/mesa-libs: make configure (not config) crashes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224847

--- Comment #4 from software at bertram-scharpf.de ---
You do not need any details to reproduce it. I found it by remembering
that this problem had occurred here several years ago. As far
as I know, at that time I solved it by a workaround. The ports collection
did not manage to fix this bug up to this day!

The cause for the problem is that LLVM builds a version number
from the Git repository it is held in. Now, in the FreeBSD ports
collection, it gets copied there without a Git history. Still the
configuration searches for a Git repo, and it finds the one in /usr/ports.

I fixed the problem by adding a line in /etc/make.conf:

    CONFIGURE_ENV+=GIT_CEILING_DIRECTORIES=/usr/ports

For the meaning of the environment variable see man 1 git.

The line should be put somewhere into Mk/bsd.port.mk; of course it
would be better to throw away the whole ports system together with portupgrade,
poudriere et al. and to rewrite it from scratch.

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