--- /dev/null
+++ Libc/Libc-391.5.21/include/libkern/Makefile.inc
@@ -0,0 +1,3 @@
+LIBKERN_INSTHDRS += OSAtomic.h
+
+LIBKERN_INSTHDRS := ${LIBKERN_INSTHDRS:S/^/${.CURDIR}\/include\/libkern\//}