Install clang-6 package if it is not present on Ubuntu when compiling against clang...

diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 1287dc851ac401d18617ee840a63ba0311946806..95d3b5aa6411993fc08723094a16e0a0477c9e4a 100644 (file)
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -250,7 +250,7 @@ jobs:
           - name: Ubuntu 16.04 Clang
             os: ubuntu-16.04
             compiler: clang-6.0
-            # note: github preinstalls compilers now, see https://github.com/actions/virtual-environments/pull/369/
+            packages: clang-6.0
 
           - name: Ubuntu Clang
             os: ubuntu-latest