--- a/make/autoconf/jdk-version.m4	Thu Mar 28 08:37:05 2019 -0700
+++ b/make/autoconf/jdk-version.m4	Thu Mar 28 10:04:27 2019 -0700
@@ -460,6 +460,7 @@
   # We could define --with flags for these, if really needed
   VERSION_CLASSFILE_MAJOR="$DEFAULT_VERSION_CLASSFILE_MAJOR"
   VERSION_CLASSFILE_MINOR="$DEFAULT_VERSION_CLASSFILE_MINOR"
+  JDK_SOURCE_TARGET_VERSION="$DEFAULT_JDK_SOURCE_TARGET_VERSION"
 
   AC_MSG_CHECKING([for version string])
   AC_MSG_RESULT([$VERSION_STRING])
@@ -483,5 +484,5 @@
   AC_SUBST(VENDOR_VERSION_STRING)
   AC_SUBST(VERSION_CLASSFILE_MAJOR)
   AC_SUBST(VERSION_CLASSFILE_MINOR)
-
+  AC_SUBST(JDK_SOURCE_TARGET_VERSION)
 ])