--- Libc/Libc-391.1.21/include/libkern/Makefile.inc
+++ Libc/Libc-498/include/libkern/Makefile.inc
@@ -1,3 +1,2 @@
-LIBKERN_INSTHDRS += OSAtomic.h
-
+LIBKERN_INSTHDRS += OSAtomic.h	OSCacheControl.h
 LIBKERN_INSTHDRS := ${LIBKERN_INSTHDRS:S/^/${.CURDIR}\/include\/libkern\//}