--- /usr/portage/media-sound/sox/sox-14.0.1.ebuild	2008-03-22 19:06:52.000000000 +0100
+++ /usr/portage/media-sound/sox/sox-14.0.1.ebuild	2008-04-12 23:21:38.000000000 +0200
@@ -28,10 +28,22 @@ 
 	amrnb? ( media-libs/amrnb )
 	amrwb? ( media-libs/amrwb )"
 
+src_unpack() {
+	unpack ${A}
+	cd ${S}
+
+	epatch "${FILESDIR}/${P}"-libavformat.diff || die
+}
+
 src_compile () {
 	# Fixes wav segfaults. See Bug #35745.
 	append-flags -fsigned-char
 
+	cd ${S}
+
+	autoconf
+	libtoolize --copy --force
+
 	econf $(use_enable alsa) \
 		$(use_enable debug) \
 		$(use_enable ao libao) \