main: inclued llvm

Author: ljgray

.github/workflows/main.yml

@@ -58,8 +58,7 @@ jobs:
       if: matrix.os == 'macos-latest'
       run: |
         brew install llvm libomp open-mpi hdf5
-        export CC=/usr/local/opt/llvm/bin/clang
-        export CPP=/usr/local/opt/llvm/bin/clang
+        export CPPFLAGS=-I/usr/local/opt/llvm/include
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2