Index: pythia8303/configure
===================================================================
--- pythia8303.orig/configure
+++ pythia8303/configure
@@ -281,7 +281,7 @@ done
 
 # Parse the user arguments and evaluate each as a global variable.
 echo "# PYTHIA configuration file." > $CFG_FILE
-echo "# Generated on" `date` "with the user supplied options:" >> $CFG_FILE
+echo "# Generated on" `date --date=@$SOURCE_DATE_EPOCH` "with the user supplied options:" >> $CFG_FILE
 for VAR in "$@"; do
     if [[ $OPTIONS =~ (^| )${VAR%%=*}($| ) ]]; then
 	echo "# $VAR" >> $CFG_FILE;