Index: head/math/vowpal_wabbit/Makefile
===================================================================
--- head/math/vowpal_wabbit/Makefile	(revision 390633)
+++ head/math/vowpal_wabbit/Makefile	(revision 390634)
@@ -1,21 +1,23 @@
 # Created by: Dmitry Sivachenko <demon@FreeBSD.org>
 # $FreeBSD$
 
 PORTNAME=	vowpal_wabbit
 PORTVERSION=	7.10
 CATEGORIES=	math
 
 MAINTAINER=	demon@FreeBSD.org
 COMMENT=	Fast out-of-core learning system
 
 LIB_DEPENDS=	libboost_thread.so:${PORTSDIR}/devel/boost-libs
 
+BROKEN_FreeBSD_9=	does not build
+
 USES=		compiler:c++11-lang libtool
 GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 USE_GITHUB=	yes
 GH_ACCOUNT=	JohnLangford
 
 CONFIGURE_ARGS=	--enable-shared=no --with-boost=${LOCALBASE}
 
 .include <bsd.port.mk>