Index: head/biology/mothur/Makefile
===================================================================
--- head/biology/mothur/Makefile	(revision 502173)
+++ head/biology/mothur/Makefile	(revision 502174)
@@ -1,33 +1,33 @@
 # $FreeBSD$
 
 PORTNAME=	mothur
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.42.1-3
 DISTVERSIONSUFFIX=	-gb670137a
 CATEGORIES=	biology
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Software for bioinformatics of the microbial ecology community
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/LICENSE.md
 
 BUILD_DEPENDS=	bash:shells/bash
 
-USES=		gmake localbase readline shebangfix
+USES=		compiler:c++11-lang gmake localbase readline shebangfix
 SHEBANG_FILES=	source/uchime_src/mk
 USE_GITHUB=	yes
 ALL_TARGET=	${PORTNAME}
 
 BINARY_ALIAS=	g++=${CXX}
 
 EXES=		${PORTNAME} uchime
 
 PLIST_FILES=	${EXES:S/^/bin\//}
 
 do-install: # https://github.com/mothur/mothur/issues/615
 .for e in ${EXES}
 	${INSTALL_PROGRAM} ${WRKSRC}/${e} ${STAGEDIR}${PREFIX}/bin
 .endfor
 
 .include <bsd.port.mk>