--- old/make/autoconf/version-numbers	2017-12-14 12:54:53.307401194 +0100
+++ new/make/autoconf/version-numbers	2017-12-14 12:54:52.759381997 +0100
@@ -30,6 +30,8 @@
 DEFAULT_VERSION_UPDATE=0
 DEFAULT_VERSION_PATCH=0
 DEFAULT_VERSION_DATE=2018-03-20
+DEFAULT_VERSION_CLASSFILE_MAJOR=54  # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
+DEFAULT_VERSION_CLASSFILE_MINOR=0
 
 LAUNCHER_NAME=openjdk
 PRODUCT_NAME=OpenJDK