--- Libc/Libc-391/sys/Makefile.inc
+++ Libc/Libc-391.4.1/sys/Makefile.inc
@@ -33,6 +33,10 @@
 .for _src in sem_open.c sem_unlink.c shm_open.c shm_unlink.c fix-3375657.c
 CFLAGS-${_src} += -D__APPLE_PR3375657_HACK__
 .endfor
+
+.include "Makefile.obsd_begin"
+OBSDMISRCS= stack_protector.c
+.include "Makefile.obsd_end"
 
 UNIX03SRCS += mmap.c mprotect.c msgctl.c msync.c munmap.c semctl.c shmctl.c