More dependency fixes for Dawn CI

Author: cuberoot

.github/workflows/dawn.yaml

@@ -93,7 +93,16 @@ jobs:
         if: matrix.platform == 'ubuntu-latest'
         run: |
           sudo apt-get update
-          sudo apt-get install -y build-essential cmake curl git gnupg2 libcurl4-openssl-dev libpython3-dev libssl-dev libx11-xcb-dev libxcursor-dev libxi-dev libxinerama-dev libxml2-dev libxrandr-dev libz-dev libz3-dev mesa-common-dev ninja-build pkg-config python3 python3-pip python3-venv tzdata unzip wget
+          sudo apt-get install -y build-essential clang cmake curl git gnupg2 libcurl4-openssl-dev libpython3-dev libssl-dev libx11-xcb-dev libxcursor-dev libxi-dev libxinerama-dev libxml2-dev libxrandr-dev libz-dev libz3-dev mesa-common-dev ninja-build pkg-config python3 python3-pip python3-venv tzdata unzip wget
+          echo "c_compiler=clang" >> "$GITHUB_OUTPUT"
+          echo "cxx_compiler=clang++" >> "$GITHUB_OUTPUT"
+
+      - name: Install prerequisites on Mac
+        if: matrix.platform == 'macos-latest'
+        run: |
+          brew install cmake ninja
+          echo "c_compiler=clang" >> "$GITHUB_OUTPUT"
+          echo "cxx_compiler=clang++" >> "$GITHUB_OUTPUT"
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -113,6 +122,9 @@ jobs:
           path: Dawn/dawn_source/
 
       - name: Build Dawn for ${{ matrix.target }}
+        env:
+          CC: ${{ env.c_compiler }}
+          CXX: ${{ env.cxx_compiler }}
         run: |
           cd Dawn
           python ci_build_dawn.py build-target --target ${{ matrix.target }}