Index: head/math/gringo/Makefile
===================================================================
--- head/math/gringo/Makefile	(revision 395767)
+++ head/math/gringo/Makefile	(revision 395768)
@@ -1,35 +1,32 @@
 # Created by: Vsevolod Stakhov <vsevolod@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	gringo
 PORTVERSION=	4.5.2
 DISTVERSIONSUFFIX=	-source
 CATEGORIES=	math devel
 MASTER_SITES=	SOURCEFORGE/potassco/${PORTNAME}/${PORTVERSION}
 
 MAINTAINER=	vsevolod@FreeBSD.org
 COMMENT=	Grounding algorithm based on semi-naive database evaluation
 
 LICENSE=	GPLv3
 
 BUILD_DEPENDS=	re2c:${PORTSDIR}/devel/re2c
 
-USES=	scons bison compiler:c++11-lang
+USES=		bison compiler:c++11-lib scons
 
 MAKE_ARGS+=	${MAKE_ENV}
 CXXFLAGS+=	-std=c++11
 MAKE_ENV+=	WITH_LUA=no
 
+# Unhide std::to_string() with GCC < 4.9 (ports/193528)
+CXXFLAGS+=	-D_GLIBCXX_USE_C99
+
 PLIST_FILES=	bin/${PORTNAME} bin/clingo
 
-.include <bsd.port.pre.mk>
-
-.if ${OSVERSION} < 1000000
-USE_GCC=	yes
-.endif
-
 do-install:
 	${INSTALL_PROGRAM} ${INSTALL_WRKSRC}/build/debug/${PORTNAME} ${STAGEDIR}${PREFIX}/bin/${PORTNAME}
 	${INSTALL_PROGRAM} ${INSTALL_WRKSRC}/build/debug/clingo ${STAGEDIR}${PREFIX}/bin/clingo
 
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>