diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index a10692b..73c6043 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -24,22 +24,26 @@ jobs:
         config:
           - {os: macos-latest,   r: 'release'}
 
-          - {os: windows-latest, r: 'release'}
-          # use 4.1 to check with rtools40's older compiler
-          - {os: windows-latest, r: '4.1'}
+          # - {os: windows-latest, r: 'release'}
+          # # use 4.1 to check with rtools40's older compiler
+          # - {os: windows-latest, r: '4.1'}
 
-          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
-          - {os: ubuntu-latest,   r: 'release'}
-          - {os: ubuntu-latest,   r: 'oldrel-1'}
-          - {os: ubuntu-latest,   r: 'oldrel-2'}
-          - {os: ubuntu-latest,   r: 'oldrel-3'}
-          - {os: ubuntu-latest,   r: 'oldrel-4'}
+          # - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
+          # - {os: ubuntu-latest,   r: 'release'}
+          # - {os: ubuntu-latest,   r: 'oldrel-1'}
+          # - {os: ubuntu-latest,   r: 'oldrel-2'}
+          # - {os: ubuntu-latest,   r: 'oldrel-3'}
+          # - {os: ubuntu-latest,   r: 'oldrel-4'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       R_KEEP_PKG_SOURCE: yes
 
     steps:
+      - run: |
+        which pkg-config || true
+        pkg-config --libs openssl || true
+
       - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-pandoc@v2