Index: head/audio/nekobi-lv2/Makefile
===================================================================
--- head/audio/nekobi-lv2/Makefile	(revision 500666)
+++ head/audio/nekobi-lv2/Makefile	(revision 500667)
@@ -1,37 +1,43 @@
 # $FreeBSD$
 
 PORTNAME=	nekobi
 DISTVERSION=	g20180825
 PORTREVISION=	1
 CATEGORIES=	audio
 PKGNAMESUFFIX=	-lv2
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Simple single-oscillator synth based on the Roland TB-303
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	lv2>0:audio/lv2 \
 		bash:shells/bash
 LIB_DEPENDS=	libjack.so:audio/jack
 
-USES=		gl gmake localbase pkgconfig shebangfix
+USES=		compiler:c++11-lang gl gmake localbase pkgconfig shebangfix
 SHEBANG_FILES=	dpf/utils/generate-ttl.sh
 USE_GITHUB=	yes
 GH_ACCOUNT=	DISTRHO
 GH_PROJECT=	Nekobi
 GH_TAGNAME=	840a692
 GH_TUPLE=	DISTRHO:DPF:ea7545a:dpf/dpf
 USE_GL=		gl
 USE_XORG=	x11
 
 CFLAGS+=	-I${FILESDIR}
 CFLAGS+=	-Wno-c++11-narrowing # clang prints errors: https://github.com/DISTRHO/Nekobi/issues/7
+
+.if exists(/usr/lib/libstdc++.so)
+post-patch:
+	@${REINPLACE_CMD} -e 's/-mtune=generic -msse -msse2 //' \
+		${WRKSRC}/dpf/Makefile.base.mk
+.endif
 
 do-install: # https://github.com/DISTRHO/Nekobi/issues/8
 	@${MKDIR} ${STAGEDIR}${PREFIX}/lib/lv2
 	cd ${WRKSRC}/bin && ${COPYTREE_SHARE} Nekobi.lv2 ${STAGEDIR}${PREFIX}/lib/lv2/
 	${INSTALL_PROGRAM} ${WRKSRC}/bin/Nekobi ${STAGEDIR}${PREFIX}/bin
 
 .include <bsd.port.mk>