Pin autoconf==2.71

Author: j-woz

dev/conda/build-generic.sh

@@ -152,8 +152,11 @@ ${SED_I[@]} -f $SETTINGS_SED swift-t-settings.sh
 #       problems with conda build
 {
   echo
+  # Anaconda Autoconf 2.72 is buggy
+  echo "Build tools:"
   which autoreconf aclocal autom4te m4
   m4 --version
+  echo
   log "BUILD SWIFT-T START: $( date '+%Y-%m-%d %H:%M:%S' )"
   ./build-swift-t.sh -vv 2>&1
   log "BUILD SWIFT-T STOP:  $( date '+%Y-%m-%d %H:%M:%S' )"

dev/conda/meta-template.yaml

@@ -29,7 +29,8 @@ m4_ifelse(getenv(ENABLE_R),`1',m4_include(env-R.yaml))
 # Remember to sync any dependency changes here with conda-install.sh
 requirements:
   build:
-    - autoconf
+    # Anaconda Autoconf 2.72 is buggy 2025-05-12
+    - autoconf==2.71
     - make
     - openjdk>=17  # Security issue in Java < 11.72.19
     - mpich-mpicc