--- a/make/autoconf/flags-cflags.m4	Mon Jul 22 10:15:46 2019 +0200
+++ b/make/autoconf/flags-cflags.m4	Fri Jul 19 11:09:41 2019 +0200
@@ -229,7 +229,7 @@
       ;;
 
     xlc)
-      DISABLE_WARNING_PREFIX="-qsuppress="
+      DISABLE_WARNING_PREFIX="-Wno-"
       CFLAGS_WARNINGS_ARE_ERRORS="-qhalt=w"
 
       # Possibly a better subset than "all" is "lan:trx:ret:zea:cmp:ret"