--- Makefile.orig	2014-09-04 22:27:07.675749605 -0300
+++ Makefile	2014-09-05 13:17:01.166681909 -0300
@@ -20,7 +20,7 @@
 
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--disable-werror --without-docs
-USES=	libtool pathfix pkgconfig tar:xz
+USES=	compiler:c++11-lib libtool pathfix pkgconfig tar:xz
 USE_LDCONFIG=	yes
 INSTALL_TARGET=	install-strip