--- libtool-2.4.2.ebuild	26 Apr 2012 13:07:54 -0000	1.5
+++ libtool-2.4.2.ebuild	15 Jan 2013 04:14:51 -0000
@@ -39,15 +39,37 @@ src_unpack() {
 	fi
 }
 
+bk() {
+	local opt=$1; shift
+	local file
+	for file ; do
+		case ${opt} in
+		save)    chmod u+rw "${file}" && cp -p "${file}"{,.orig} || die ;;
+		touch)   touch -r "${file}"{.orig,} || die ;;
+		restore) cp -p "${file}"{.orig,} || die ;;
+		esac
+	done
+}
+
 src_prepare() {
 	use vanilla && return 0
 
+	# We need to patch the local libtool.m4 because that is used to generate
+	# the local libtool which is later installed.  But we don't want to install
+	# the hacked libtool.m4 as that'll get copied into other random projects.
+	bk save libltdl/{m4/libtool.m4,config/ltmain.sh}
+	epatch "${FILESDIR}"/${PN}-2.4.2-dynamic-gcc.patch #88596
+	# Hack the timestamp so that we regen once, and `make` doesn't try again.
+	bk touch libltdl/{m4/libtool.m4,config/ltmain.sh}
+
 	cd libltdl/m4
 	epatch "${FILESDIR}"/1.5.20/${PN}-1.5.20-use-linux-version-in-fbsd.patch #109105
 	cd ..
 	AT_NOELIBTOOLIZE=yes eautoreconf
 	cd ..
 	AT_NOELIBTOOLIZE=yes eautoreconf
+
+	bk restore libltdl/m4/libtool.m4
 }
 
 src_configure() {
@@ -63,6 +85,7 @@ src_configure() {
 	export CONFIG_SHELL=/bin/bash
 
 	econf $(use_enable static-libs static)
+	bk restore libltdl/config/ltmain.sh
 }
 
 src_install() {