Index: head/math/eclib/Makefile
===================================================================
--- head/math/eclib/Makefile	(revision 529228)
+++ head/math/eclib/Makefile	(revision 529229)
@@ -1,31 +1,31 @@
 # Created by: thierry@pompo.net
 # $FreeBSD$
 
 PORTNAME=	eclib
 PORTVERSION=	20190909
 DISTVERSIONPREFIX=	v
 CATEGORIES=	math
 
 MAINTAINER=	thierry@FreeBSD.org
 COMMENT=	C++ library for arithmetic on elliptic curves
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libntl.so:math/ntl		\
 		libpari.so:math/pari		\
 		libflint.so:math/flint2		\
 		libboost_thread.so:devel/boost-libs
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	JohnCremona
 
-USES=		autoreconf libtool localbase
+USES=		autoreconf compiler:c++11-lang libtool localbase
 
 OPTIONS_DEFINE=	DOCS
 
 LIBS+=		"-lm"
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--with-flint=${LOCALBASE} --with-boost=${LOCALBASE}
 USE_LDCONFIG=	yes
 
 .include <bsd.port.mk>