Try system cc

Author: rmjarvis

.github/workflows/wheels.yml

@@ -88,13 +88,14 @@ jobs:
           CIBW_BUILD: "*macosx*"
           CIBW_ARCHS: arm64
           CIBW_SKIP: cp36* cp37* cp38* pp*
-          CIBW_BEFORE_ALL: brew install llvm libomp fftw eigen
+          #CIBW_BEFORE_ALL: brew install llvm libomp fftw eigen
+          CIBW_BEFORE_ALL: brew install fftw eigen
           CIBW_ENVIRONMENT: >-
-            CC="/opt/homebrew/opt/llvm/bin/clang -stdlib=libc++"
-            CCX="/opt/homebrew/opt/llvm/bin/clang++ -stdlib=libc++"
-            LDFLAGS="-L/opt/homebrew/opt/llvm/lib -Wl,-rpath,/opt/homebrew/opt/llvm/lib"
-            CPPFLAGS="-I/opt/homebrew/opt/llvm/include"
-            PATH="/opt/homebrew/opt/llvm/bin:$PATH"
+            #CC=/opt/homebrew/opt/llvm/bin/clang
+            #CCX=/opt/homebrew/opt/llvm/bin/clang++
+            #LDFLAGS="-L/opt/homebrew/opt/llvm/lib -Wl,-rpath,/opt/homebrew/opt/llvm/lib"
+            #CPPFLAGS="-I/opt/homebrew/opt/llvm/include"
+            #PATH="/opt/homebrew/opt/llvm/bin:$PATH"
             FFTW_DIR="/opt/homebrew/lib"
             MACOSX_DEPLOYMENT_TARGET=14.0