The ebuild needs in src_install() a change to CLANG_VERSION=3.9 I think. I am compiling again. Reproducible: Always Steps to Reproduce: 1. edit /etc/portage/package.keywords add =sys-devel/llvm-9999 ~amd64 ** add =sys-devel/clang-9999-r100 ~amd64 ** 2. emerge llvm clang 3. Actual Results: -- Installing: /var/tmp/portage/sys-devel/llvm-9999/image/usr/share/llvm/cmake/./DetermineGCCCompatible.cmake -- Installing: /var/tmp/portage/sys-devel/llvm-9999/image/usr/share/llvm/cmake/./HandleLLVMStdlib.cmake rm: cannot remove ‘/var/tmp/portage/sys-devel/llvm-9999/image/usr/bin/clang-3.8’: No such file or directory * ERROR: sys-devel/llvm-9999::gentoo failed (install phase): Expected Results: emerge success Git mirror says 3.9
It works after the change.
Indeed, 3.8 is branched so trunk is now 3.9 Fixed in current -9999 ebuild, thanks for the report!