CI: osx use cmake 3.18

diff --git a/.github/workflows/osx.yml b/.github/workflows/osx.yml
index 091d544d37200276bcc8671c05d18916c2f5b9a0..91ecdc5338398e779a6d7f817f5049cc9d5fd62c 100644 (file)
--- a/.github/workflows/osx.yml
+++ b/.github/workflows/osx.yml
@@ -14,6 +14,8 @@ jobs:
     - name: setup
       run: |
         ./contrib/utilities/download_clang_format
+        # force cmake version:
+        pip install cmake==3.18.4
     - name: info
       run: |
         g++ -v
@@ -41,6 +43,8 @@ jobs:
     - uses: actions/checkout@v2
     - name: setup
       run: |
+        # force cmake version:
+        pip install cmake==3.18.4
         brew install openmpi
         cmake --version
         # uncomment these for a gcc based build