Index: head/audio/rtmidi/Makefile
===================================================================
--- head/audio/rtmidi/Makefile	(revision 487803)
+++ head/audio/rtmidi/Makefile	(revision 487804)
@@ -1,24 +1,24 @@
 # Created by: Yuri Victorovich <yuri@rawbw.com>
 # $FreeBSD$
 
 PORTNAME=	rtmidi
 DISTVERSIONPREFIX=	v
 DISTVERSION=	3.0.0
 CATEGORIES=	audio
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Set of C++ classes that provide a common API for realtime MIDI I/O
 
 LICENSE=	MIT
 
 LIB_DEPENDS=	libjack.so:audio/jack
 
-USES=		autoreconf libtool localbase
+USES=		autoreconf compiler:c11 libtool localbase
 GNU_CONFIGURE=	yes
 USE_GITHUB=	yes
 GH_ACCOUNT=	thestk
 CONFIGURE_ARGS=	--with-jack --disable-static
 USE_LDCONFIG=	yes
 INSTALL_TARGET=	install-strip
 
 .include <bsd.port.mk>