$ cat busybox.patch

--- a/mk/elftoolchain.inc.mk
+++ b/mk/elftoolchain.inc.mk
@@ -12,7 +12,8 @@
 .include <bsd.obj.mk>
 
 .if ${OS_HOST} == "Darwin" || ${OS_HOST} == "DragonFly" || \
-	${OS_HOST} == "FreeBSD" || ${OS_HOST} == "OpenBSD"
+	${OS_HOST} == "FreeBSD" || ${OS_HOST} == "OpenBSD" || \
+	${OS_HOST} == "Linux"
 # Simulate <bsd.inc.mk>.
 
 NOBINMODE?=	444		# Missing in OpenBSD's rule set.