I'm trying to build LLVM-9.0.1 with the optional Clang package, which
appears to be required for Firefox to build.
This goes OK until invoking ninja, which immediately stops the build,
with the message
ninja: error: '../cmake/modules/Generate VersionFromVCS.cmake', needed
by 'tools/clang/lib/Basic/VCSVersion.inc', missing and no known rule to
make it
Building LLVM without the Clang package completes normally, but the
Firefox build will complain that it is needed. Curiously I built Firefox
on LFS 8.4, in the same way, without this problem.
Hope someone can throw some light on this, as I've found nothing, other
than some similar PATH related issues with cmake, after searching the web.
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