--- Libc/Libc-391.2.6/mach/headers/Makefile.inc
+++ Libc/Libc-262.3.2/mach/headers/Makefile.inc
@@ -4,7 +4,5 @@
                  mach_interface.h \
                  port_obj.h \
                  sync.h \
-                 task.h \
-                 thread_act.h \
                  vm_task.h
 MACH_INSTHDRS := ${MACH_INSTHDRS:S/^/${.CURDIR}\/mach\/headers\//}