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[build] Set GITVERSION only if there is a git repository
The $(BIN)/version.%.o target will fail if iPXE is built within a non-git repository, e.g. when the user downloaded and extracted an archive containing iPXE sources, *and* if any parent directory of the iPXE sources is a git repository (or even contains a directory named ".git"). This is because git will by default ascend the directory tree and look for ".git". The problem typically manifests on source based distributions, see for example https://bugs.gentoo.org/show_bug.cgi?id=482804 Modified-by: Michael Brown <mcb30@ipxe.org> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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