--- a/make/autoconf/buildjdk-spec.gmk.in	Wed Dec 20 17:36:50 2017 +0100
+++ b/make/autoconf/buildjdk-spec.gmk.in	Wed Dec 20 09:14:06 2017 -0800
@@ -55,6 +55,7 @@
 OPENJDK_TARGET_CPU_BITS := @OPENJDK_BUILD_CPU_BITS@
 OPENJDK_TARGET_CPU_ENDIAN := @OPENJDK_BUILD_CPU_ENDIAN@
 OPENJDK_TARGET_CPU_LEGACY := @OPENJDK_BUILD_CPU_LEGACY@
+OPENJDK_TARGET_OS_INCLUDE_SUBDIR := @OPENJDK_BUILD_OS_INCLUDE_SUBDIR@
 
 HOTSPOT_TARGET_OS := @HOTSPOT_BUILD_OS@
 HOTSPOT_TARGET_OS_TYPE := @HOTSPOT_BUILD_OS_TYPE@