--- a/make/autoconf/jdk-version.m4	Thu Jan 18 09:01:00 2018 -0800
+++ b/make/autoconf/jdk-version.m4	Thu Jan 18 18:58:46 2018 +0000
@@ -381,6 +381,10 @@
     VENDOR_VERSION_STRING="$with_vendor_version_string"
   fi
 
+  # We could define --with flags for these, if really needed
+  VERSION_CLASSFILE_MAJOR="$DEFAULT_VERSION_CLASSFILE_MAJOR"
+  VERSION_CLASSFILE_MINOR="$DEFAULT_VERSION_CLASSFILE_MINOR"
+
   AC_MSG_CHECKING([for version string])
   AC_MSG_RESULT([$VERSION_STRING])
 
@@ -398,4 +402,7 @@
   AC_SUBST(VERSION_IS_GA)
   AC_SUBST(VERSION_DATE)
   AC_SUBST(VENDOR_VERSION_STRING)
+  AC_SUBST(VERSION_CLASSFILE_MAJOR)
+  AC_SUBST(VERSION_CLASSFILE_MINOR)
+
 ])