From: Basil L. Contovounesios <contovob@tcd.ie>
Date: Sat, 18 Sep 2021 10:49:07 +0000 (+0100)
Subject: Fontify Libtool macros in autoconf-mode
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Fontify Libtool macros in autoconf-mode

* lisp/progmodes/autoconf.el (autoconf-font-lock-keywords): Apply
font-lock-keyword-face also to Libtool's LT_* macros (bug#50659).
---

diff --git a/lisp/progmodes/autoconf.el b/lisp/progmodes/autoconf.el
index 73cf290f43c..78148ccf858 100644
--- a/lisp/progmodes/autoconf.el
+++ b/lisp/progmodes/autoconf.el
@@ -44,7 +44,7 @@
   "A\\(?:H_TEMPLATE\\|C_\\(?:SUBST\\|DEFINE\\(?:_UNQUOTED\\)?\\)\\)(\\[*\\(\\(?:\\sw\\|\\s_\\)+\\)\\]*")
 
 (defvar autoconf-font-lock-keywords
-  `(("\\_<A[CHMS]_\\(?:\\sw\\|\\s_\\)+" . font-lock-keyword-face)
+  `(("\\_<\\(?:A[CHMS]\\|LT\\)_\\(?:\\sw\\|\\s_\\)+" . font-lock-keyword-face)
     (,autoconf-definition-regexp
      1 font-lock-function-name-face)
     ;; Are any other M4 keywords really appropriate for configure.ac,