--- a/make/autoconf/source-dirs.m4	Tue Sep 12 19:03:39 2017 +0200
+++ b/make/autoconf/source-dirs.m4	Tue Sep 12 19:03:56 2017 +0200
@@ -39,7 +39,7 @@
   AC_SUBST(JAXWS_TOPDIR)
   AC_SUBST(HOTSPOT_TOPDIR)
   AC_SUBST(NASHORN_TOPDIR)
-  AC_SUBST(JDK_TOPDIR)
+  AC_SUBST(TOPDIR)
 ])
 
 AC_DEFUN_ONCE([SRCDIRS_SETUP_ALTERNATIVE_TOPDIRS],