By testing llvm I could not compile llvm 3.8 because of the wrong version of cmake Centos 7 2.8.11-5.el7 Centos 6.7 - 2.8.12.2-4.el7.centos (recompile same revision) build done im my repo to get wheel.... http://centos.cms4all.org/centos/7/llvm/SRPM/ Sincerely Andy