Index: head/audio/libvorbis/Makefile
===================================================================
--- head/audio/libvorbis/Makefile	(revision 541351)
+++ head/audio/libvorbis/Makefile	(revision 541352)
@@ -1,32 +1,35 @@
 # Created by: t.vanklaveren@student.utwente.nl
 # $FreeBSD$
 
 PORTNAME=	libvorbis
 PORTVERSION=	1.3.7
+PORTREVISION=	1
 PORTEPOCH=	3
 CATEGORIES=	audio
 MASTER_SITES=	https://downloads.xiph.org/releases/vorbis/ \
 		https://download.videolan.org/videolan/testing/contrib/vorbis/
 
 MAINTAINER=	naddy@FreeBSD.org
 COMMENT=	Audio compression codec library
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libogg.so:audio/libogg
 
-USES=		libtool pathfix tar:xz
+# The included libtool is broken and loses the -lm dependency_lib.
+USES=		libtool:build pathfix tar:xz
 USE_LDCONFIG=	yes
 
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--with-ogg=${LOCALBASE}
+MAKE_ARGS=	LIBTOOL=${PREFIX}/bin/libtool
 INSTALL_TARGET=	install-strip
 TEST_TARGET=	check
 
 OPTIONS_DEFINE=	DOCS
 
 post-install:
 	cd ${STAGEDIR}${PREFIX}/share/doc && ${MV} ${DISTNAME} libvorbis
 
 .include <bsd.port.mk>