Fix ubuntu install, add macos

.github/workflows/R-CMD-check.yaml

@@ -23,8 +23,8 @@ jobs:
       fail-fast: false
       matrix:
         config:
-          - {os: macOS-latest, r: 'devel', rtools: ''}
-          - {os: macOS-latest, r: 'release', rtools: ''}
+          - {os: macOS-latest, r: 'devel', rtools: 'true'}
+          - {os: macOS-latest, r: 'release', rtools: 'true'}
           - {os: windows-latest, r: 'devel', rtools: '44'}
           - {os: windows-latest, r: 'release', rtools: '44'}
           - {os: windows-latest, r: 'oldrel', rtools: '43'}
@@ -65,12 +65,21 @@ jobs:
 
       - uses: r-lib/actions/[email protected]
         with:
+          cache: "always"
           extra-packages: any::rcmdcheck, local::.
 
       - name: Install POCL on Ubuntu Runners
         if: ${{ matrix.config.os == 'ubuntu-latest' }}
         run: |
-          sudo apt-get update && apt-get install -y ocl-icd-opencl-dev pocl-opencl-icd
+          sudo apt-get update && sudo apt-get install -y ocl-icd-opencl-dev pocl-opencl-icd
+        shell: bash
+
+      - name: Install POCL on MacOS Runners
+        if: ${{ matrix.config.os == 'macOS-latest' }}
+        run: |
+          brew install pocl
+          # Set LDLIBS_OPENCL environment variable
+          echo "LDLIBS_OPENCL=-L/opt/homebrew/opt/opencl-icd-loader/lib -lOpenCL" >> $GITHUB_ENV
         shell: bash
 
       - name: Install cmdstan