From a2fc6c9fa1494a6cc9be57f7c8a0bebff1eae28b Mon Sep 17 00:00:00 2001
From: Flatcar Buildbot <buildbot@flatcar-linux.org>
Date: Mon, 17 Mar 2025 07:08:27 +0000
Subject: [PATCH] eclass/libtool: Sync with Gentoo

It's from Gentoo commit c263fc4e410d5f260eeb0969a350cf7ef00da6ba.
---
 .../portage-stable/eclass/libtool.eclass      | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/sdk_container/src/third_party/portage-stable/eclass/libtool.eclass b/sdk_container/src/third_party/portage-stable/eclass/libtool.eclass
index 8ffc06d6ff..18596a9223 100644
--- a/sdk_container/src/third_party/portage-stable/eclass/libtool.eclass
+++ b/sdk_container/src/third_party/portage-stable/eclass/libtool.eclass
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: libtool.eclass
@@ -22,10 +22,23 @@ case ${EAPI} in
 	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
 esac
 
-BDEPEND=">=app-portage/elt-patches-20240116"
-
 inherit toolchain-funcs
 
+# @ECLASS_VARIABLE: LIBTOOL_DEPEND
+# @OUTPUT_VARIABLE
+# @DESCRIPTION:
+# Contains dependency on app-portage/elt-patches in *DEPEND format.
+LIBTOOL_DEPEND=">=app-portage/elt-patches-20250306"
+
+# @ECLASS_VARIABLE: LIBTOOL_AUTO_DEPEND
+# @PRE_INHERIT
+# @DESCRIPTION:
+# Set to 'no' to disable automatically adding to DEPEND.  This lets
+# ebuilds form conditional depends by using ${LIBTOOL_DEPEND} in
+# their own DEPEND string.
+: "${LIBTOOL_AUTO_DEPEND:=yes}"
+[[ ${LIBTOOL_AUTO_DEPEND} != "no" ]] && BDEPEND=${LIBTOOL_DEPEND}
+
 # @FUNCTION: elibtoolize
 # @USAGE: [dirs] [--portage] [--reverse-deps] [--patch-only] [--remove-internal-dep=xxx] [--shallow] [--no-uclibc]
 # @DESCRIPTION: