Try just setting pkg_config_path.

Author: jonathangreen

.github/workflows/macosx.yml

@@ -19,8 +19,8 @@ jobs:
       - name: Build macosx_x86_64 wheel
         env:
           CC: clang
-          CFLAGS: "-fprofile-instr-generate -fcoverage-mapping -I/usr/local/opt/libxml2/include"
-          LDFLAGS: "-fprofile-instr-generate -fcoverage-mapping -L/usr/local/opt/libxml2/lib"
+          CFLAGS: "-fprofile-instr-generate -fcoverage-mapping"
+          LDFLAGS: "-fprofile-instr-generate -fcoverage-mapping"
           PKG_CONFIG_PATH: "/usr/local/opt/libxml2/lib/pkgconfig"
         run: |
           python -m build