diff --git a/lib/csu/Makefile b/lib/csu/Makefile
index c5ff9207427d..5c270d4c31a7 100644
--- a/lib/csu/Makefile
+++ b/lib/csu/Makefile
@@ -1,5 +1,7 @@
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 .if exists(${.CURDIR}/${MACHINE_ARCH})
 SUBDIR+= ${MACHINE_ARCH}
 .else