Comment # 7 on bug 1120098 from Wolfgang Bauer

(In reply to Aaron Puchert from comment #0)
> CMake Error at /usr/lib64/cmake/clang/ClangTargets.cmake:296 (message):
>   The imported target "clang" references the file
> 
>      "/usr/bin/clang-7"
> 
>   but this file does not exist.  Possible reasons include: [...]

This problem still exists in Leap 15.1 it seems, see bug#1138457.