Index: .github/workflows/build.yml
===================================================================
diff -u -rd9682859a7044a4837a6cd6a37f90847df2d9b69 -r72fcc443795dbc7383276e587ddc4606b6875c52
--- .github/workflows/build.yml	(.../build.yml)	(revision d9682859a7044a4837a6cd6a37f90847df2d9b69)
+++ .github/workflows/build.yml	(.../build.yml)	(revision 72fcc443795dbc7383276e587ddc4606b6875c52)
@@ -14,7 +14,7 @@
         #   - ""
         include:
           - os: macos-latest
-            compiler: gcc-11
+            compiler: gcc-12
             tcltag: core-8-6-branch
             experimental: [true]
           - os: macos-latest
@@ -46,11 +46,11 @@
             tcltag: core-8-6-branch
             experimental: [true]
           - os: macos-latest
-            compiler: gcc-11
+            compiler: gcc-12
             tcltag: core-8-branch
             experimental: [true]
           - os: macos-latest
-            compiler: gcc-11
+            compiler: gcc-12
             tcltag: core-8-5-branch
             experimental: [true]
           - os: ubuntu-latest
@@ -62,15 +62,15 @@
             tcltag: core-8-5-branch
             experimental: [true]
           - os: macos-latest
-            compiler: gcc-11
+            compiler: gcc-12
             tcltag: core-8-5-19
             experimental: [false]
           - os: macos-latest
-            compiler: gcc-11
+            compiler: gcc-12
             tcltag: core-8-6-15
             experimental: [false]
           - os: macos-latest
-            compiler: gcc-11
+            compiler: gcc-12
             tcltag: core-9-0-0
             experimental: [false]
           - os: ubuntu-latest