$OpenBSD: patch-src_mkhdr,v 1.4 2021/01/30 12:51:34 jsg Exp $
Index: src/mkhdr
--- src/mkhdr.orig
+++ src/mkhdr
@@ -11,8 +11,8 @@ CC=9c
 LD=9l
 AS=no-9a
 AR=9ar
-CFLAGS=
-LDFLAGS=
+CFLAGS=${CCFLAGS} -pthread
+LDFLAGS=-pthread
 AFLAGS=
 CLEANFILES=
 NUKEFILES=
