--- cl-original/tools/ccopts.sh	2023-11-01 09:49:13.035146404 +0100
+++ cl-patched/tools/ccopts.sh	2023-11-01 10:14:41.633786631 +0100
@@ -1062,7 +1062,7 @@
 		if [ $GENERICBUILD -gt 0 ] ; then
 			echo "  (Enabling lowest-common-denominator build options for cross-platform library)." >&2 ;
 		else
-			CCARGS="$CCARGS -march=x86-64-v3" ;
+			CCARGS="$CCARGS -m64" ;
 		fi
 	elif [ "$COMPILER_VER" -ge 45 ] ; then
 		if [ $GENERICBUILD -gt 0 ] ; then