From: Paul Zander <negril.nx+gentoo@gmail.com>
look for the merged clang library so we can find clang
diff --git a/build_files/cmake/Modules/FindClang.cmake b/build_files/cmake/Modules/FindClang.cmake
index 1957c63..5620b84 100644
--- a/build_files/cmake/Modules/FindClang.cmake
+++ b/build_files/cmake/Modules/FindClang.cmake
@@ -85,6 +85,7 @@ set(_CLANG_FIND_COMPONENTS
   clangAST
   clangLex
   clangBasic
+  clang-cpp
 )
 
 set(_CLANG_LIBRARIES)