--- /dev/null
+++ Libc/Libc-391.4.2/mach/headers/Makefile.inc
@@ -0,0 +1,10 @@
+MACH_INSTHDRS += mach.h \
+                 mach_error.h \
+                 mach_init.h \
+                 mach_interface.h \
+                 port_obj.h \
+                 sync.h \
+                 task.h \
+                 thread_act.h \
+                 vm_task.h
+MACH_INSTHDRS := ${MACH_INSTHDRS:S/^/${.CURDIR}\/mach\/headers\//}