Builidng Clang and LLVM

Greetings,

I have the below issue on my clang llvm build (build was successful):

/opt/llvm/build/install/bin/llvm-config --ldflags --libs --system-libs
-L/opt/llvm/build/Release/lib
llvm-config: error: component libraries and shared library

llvm-config: error: missing: /opt/llvm/build/Release/lib/libgtest.a
llvm-config: error: missing: /opt/llvm/build/Release/lib/libgtest_main.a
llvm-config: error: missing: /opt/llvm/build/Release/lib/libLLVMTestingSupport.a