https://lists.gnu.org/archive/html/libtool-patches/2016-02/msg00002.html

From 53419307d5b44e5b0cff80d76f88ea02f237b747 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Sat, 13 Feb 2016 03:32:20 -0500
Subject: [PATCH] libtoolize: don't execute automake and autoconf on every
 invocation.

Same fix as applied to libtool in commit 408cfb9c5fa8a666917167ffb806cb
to delay use of automake/autoconf to when the --help option is actually
specified.

* libtoolize.in (func_help): Override func_help() from
gl/build-aux/options-parser to only run automake --version and
autoconf --version when libtool --help is executed on the command
line.
---
 libtoolize.in | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/libtoolize.in b/libtoolize.in
index 3fe61ce..0d4af3d 100644
--- a/libtoolize.in
+++ b/libtoolize.in
@@ -94,7 +94,12 @@ usage_message="Options:
 "
 
 # Additional text appended to 'usage_message' in response to '--help'.
-long_help_message=$long_help_message"
+func_help ()
+{
+    $debug_cmd
+
+    func_usage_message
+    $ECHO "$long_help_message
        'environment'   show warnings about LIBTOOLIZE_OPTIONS content
        'file'          show warnings about file copying and linking
 
@@ -120,8 +125,9 @@ include the following information:
 
 Report bugs to <@PACKAGE_BUGREPORT@>.
 GNU @PACKAGE@ home page: <@PACKAGE_URL@>.
-General help using GNU software: <http://www.gnu.org/gethelp/>.
-"
+General help using GNU software: <http://www.gnu.org/gethelp/>."
+    exit 0
+}
 
 warning_categories='environment file'
 
-- 
2.6.2