Index: .github/workflows/build.yml
===================================================================
diff -u -N -rcf79aef082102d2dcc7885da429cf6b34aea0388 -rf29f3c6947413a98399c198cf966a526da536861
--- .github/workflows/build.yml	(.../build.yml)	(revision cf79aef082102d2dcc7885da429cf6b34aea0388)
+++ .github/workflows/build.yml	(.../build.yml)	(revision f29f3c6947413a98399c198cf966a526da536861)
@@ -17,7 +17,7 @@
             tcltag: core-8-6-branch
             experimental: [true]
           - os: macos-latest
-            compiler: clang-11
+            compiler: clang
             tcltag: core-8-6-branch
             experimental: [true]
           - os: ubuntu-latest
@@ -28,6 +28,14 @@
             compiler: clang-11
             tcltag: core-8-6-branch
             experimental: [true]
+          - os: macos-latest
+            compiler: gcc-10
+            tcltag: core-8-branch
+            experimental: [true]
+          - os: macos-latest
+            compiler: gcc-10
+            tcltag: core-8-5-branch
+            experimental: [true]
           - os: ubuntu-latest
             compiler: gcc-10
             tcltag: core-8-branch
@@ -36,6 +44,18 @@
             compiler: gcc-10
             tcltag: core-8-5-branch
             experimental: [true]
+          - os: macos-latest
+            compiler: gcc-10
+            tcltag: core-8-5-19
+            experimental: [false]
+          - os: macos-latest
+            compiler: gcc-10
+            tcltag: core-8-6-11
+            experimental: [false]
+          - os: macos-latest
+            compiler: gcc-10
+            tcltag: core-8-7-a3
+            experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
             tcltag: core-8-5-19