diff --git a/chroot_version_hooks.d/49_update_libtool b/chroot_version_hooks.d/49_update_libtool
new file mode 100644
index 0000000000..c8693e34ce
--- /dev/null
+++ b/chroot_version_hooks.d/49_update_libtool
@@ -0,0 +1,12 @@
+# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Update libtool to make sure it's in sync with toolchain.
+
+if grep -q 4.6.x-google /usr/bin/libtool; then
+   info "Rebuilding libtool after gcc upgrade"
+   sudo -E emerge libtool -q
+fi
+
+exit 0