Prevent (unix|win)/configure being re-generated with anything else then autoconf-2.72

Author: jan.nijtmans

.github/workflows/linux-build.yml

@@ -16,7 +16,7 @@ env:
   ERROR_ON_FAILURES: 1
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         compiler:
@@ -124,7 +124,7 @@ jobs:
           name: Tk ${{ env.VERSION }} HTML documentation (snapshot)
           path: /tmp/dist/tk*/html
   test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         compiler:

.github/workflows/linux-with-tcl9-build.yml

@@ -16,7 +16,7 @@ env:
   ERROR_ON_FAILURES: 1
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         compiler:
@@ -105,7 +105,7 @@ jobs:
             exit 1
           }
   test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         compiler:

.github/workflows/onefiledist.yml

@@ -11,7 +11,7 @@ permissions:
 jobs:
   linux:
     name: Linux
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     defaults:
       run:
         shell: bash

.github/workflows/win-build.yml

@@ -12,7 +12,7 @@ env:
   ERROR_ON_FAILURES: 1
 jobs:
   msvc:
-    runs-on: windows-2022
+    runs-on: windows-2025
     defaults:
       run:
         shell: powershell
@@ -99,7 +99,7 @@ jobs:
              throw "nmake exit code: $lastexitcode"
           }
   gcc:
-    runs-on: windows-2019
+    runs-on: windows-2025
     defaults:
       run:
         shell: msys2 {0}

unix/configure.ac

@@ -4,7 +4,7 @@ dnl	generate the file "configure", which is run during Tk installation
 dnl	to configure the system for the local environment.
 
 AC_INIT([tk],[9.1])
-AC_PREREQ([2.69])
+AC_PREREQ([2.72])
 
 dnl This is only used when included from macosx/configure.ac
 m4_ifdef([SC_USE_CONFIG_HEADERS], [

win/configure.ac

@@ -5,7 +5,7 @@
 
 AC_INIT([tk],[9.1])
 AC_CONFIG_SRCDIR([../generic/tk.h])
-AC_PREREQ([2.69])
+AC_PREREQ([2.72])
 
 # The following define is needed when building with Cygwin since newer
 # versions of autoconf incorrectly set SHELL to /bin/bash instead of