--- Libc/Libc-391.1.21/threads/Makefile.inc
+++ Libc/Libc-498.1.1/threads/Makefile.inc
@@ -1,7 +1,9 @@
 .PATH: ${.CURDIR}/${MACHINE_ARCH}/threads ${.CURDIR}/threads
 
+.ifnmake autopatch
 .if exists(${.CURDIR}/${MACHINE_ARCH}/threads/Makefile.inc)
 .include "${.CURDIR}/${MACHINE_ARCH}/threads/Makefile.inc"
 .endif
+.endif # !autopatch
 
 MISRCS += cprocs.c       cthreads.c     lu_utils.c     mig_support.c