--- old/make/autoconf/spec.gmk.in	2017-12-14 12:54:52.367368265 +0100
+++ new/make/autoconf/spec.gmk.in	2017-12-14 12:54:52.079358176 +0100
@@ -78,6 +78,7 @@
 OPENJDK_TARGET_CPU_LEGACY:=@OPENJDK_TARGET_CPU_LEGACY@
 OPENJDK_TARGET_CPU_LEGACY_LIB:=@OPENJDK_TARGET_CPU_LEGACY_LIB@
 OPENJDK_TARGET_CPU_OSARCH:=@OPENJDK_TARGET_CPU_OSARCH@
+OPENJDK_TARGET_OS_INCLUDE_SUBIDR:=@OPENJDK_TARGET_OS_INCLUDE_SUBDIR@
 
 HOTSPOT_TARGET_OS := @HOTSPOT_TARGET_OS@
 HOTSPOT_TARGET_OS_TYPE := @HOTSPOT_TARGET_OS_TYPE@
@@ -100,6 +101,8 @@
 OPENJDK_BUILD_CPU_BITS:=@OPENJDK_BUILD_CPU_BITS@
 OPENJDK_BUILD_CPU_ENDIAN:=@OPENJDK_BUILD_CPU_ENDIAN@
 
+OPENJDK_BUILD_OS_INCLUDE_SUBIDR:=@OPENJDK_TARGET_OS_INCLUDE_SUBDIR@
+
 # Target platform value in ModuleTarget class file attribute.
 OPENJDK_MODULE_TARGET_PLATFORM:=@OPENJDK_MODULE_TARGET_PLATFORM@
 
@@ -175,6 +178,10 @@
 # Vendor version string
 VENDOR_VERSION_STRING := @VENDOR_VERSION_STRING@
 
+# Class-file version
+VERSION_CLASSFILE_MAJOR := @VERSION_CLASSFILE_MAJOR@
+VERSION_CLASSFILE_MINOR := @VERSION_CLASSFILE_MINOR@
+
 # Convenience CFLAGS settings for passing version information into native programs.
 VERSION_CFLAGS := \
     -DVERSION_FEATURE=$(VERSION_FEATURE) \
@@ -190,6 +197,8 @@
     -DVERSION_SPECIFICATION='"$(VERSION_SPECIFICATION)"' \
     -DVERSION_DATE='"$(VERSION_DATE)"' \
     -DVENDOR_VERSION_STRING='"$(VENDOR_VERSION_STRING)"' \
+    -DVERSION_CLASSFILE_MAJOR=$(VERSION_CLASSFILE_MAJOR) \
+    -DVERSION_CLASSFILE_MINOR=$(VERSION_CLASSFILE_MINOR) \
     #
 
 # Platform naming variables