--- configure
+++ configure
@@ -4622,7 +4622,7 @@
       if test "$aix_use_runtimelinking" = yes; then
 	# Warning - without using the other runtime loading flags (-brtl),
 	# -berok will link without error, but may produce a broken library.
-	allow_undefined_flag='-berok'
+	allow_undefined_flag=unsupported
         # Determine the default libpath from the value encoded in an
         # empty executable.
         cat >conftest.$ac_ext <<_ACEOF