first attempt

Author: odesenfans

.github/workflows/pytest.yml

@@ -26,10 +26,18 @@ jobs:
       - name: "apt-get install"
         run: |
           sudo apt-get update
-          sudo apt-get install -y python3-pip libsodium-dev libgmp-dev
+          sudo apt-get install -y python3-pip libsodium-dev libgmp-dev build-essential
         if: runner.os == 'Linux'
 
       - run: |
+          # Ensure Xcode CLT are ready (usually preinstalled on GitHub runners)
+          sudo xcode-select -s /Applications/Xcode.app/Contents/Developer || true
+          sudo xcodebuild -license accept || true
+
+          # Homebrew is present on GH runners; update and add LLVM + pkg-config
+          brew update
+          brew install llvm pkg-config
+          
           brew install libsodium
           echo "DYLD_LIBRARY_PATH=$(brew --prefix libsodium)/lib" >> $GITHUB_ENV
         if: runner.os == 'macOS'