--- a/make/autoconf/spec.gmk.in	Thu Mar 28 08:37:05 2019 -0700
+++ b/make/autoconf/spec.gmk.in	Thu Mar 28 10:04:27 2019 -0700
@@ -208,6 +208,8 @@
 VERSION_CLASSFILE_MAJOR := @VERSION_CLASSFILE_MAJOR@
 VERSION_CLASSFILE_MINOR := @VERSION_CLASSFILE_MINOR@
 
+JDK_SOURCE_TARGET_VERSION := @JDK_SOURCE_TARGET_VERSION@
+
 # Convenience CFLAGS settings for passing version information into native programs.
 VERSION_CFLAGS := \
     -DVERSION_FEATURE=$(VERSION_FEATURE) \