1.5.0-noundef-cxx

--- configure
+++ configure
@@ -9995,7 +9997,7 @@
     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_CXX='-berok'
+      no_undefined_flag_CXX=' ${wl}-bernotok'
       # Determine the default libpath from the value encoded in an empty executable.
       cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"