https://github.com/notroj/cadaver/pull/42

From 2eab7a8225b6fc0c6fd4773794abe83561f2d733 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Wed, 17 Apr 2024 00:48:11 +0100
Subject: [PATCH] m4: fix quoting in readline.m4

Without this, with autoconf-2.72 at least, we get:
```
$ ./configure
[...]
checking for pkg-config... /usr/sbin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for tputs in -lcurses... ./configure: 5319: ac_fn_c_try_link: not found
no
checking for tputs in -lncurses... no
[...]
```
--- a/m4/readline.m4
+++ b/m4/readline.m4
@@ -9,24 +9,21 @@ AC_ARG_ENABLE(readline,
 	[use_readline=$enableval],
 	[use_readline=yes])  dnl Defaults to ON (if found)
 
-if test "$use_readline" = "yes"; then
-	AC_CHECK_LIB(curses, tputs, LIBS="$LIBS -lcurses",
-		AC_CHECK_LIB(ncurses, tputs))
-	AC_CHECK_LIB(readline, readline)
+AS_IF([test "$use_readline" = "yes"], [
+	AC_CHECK_LIB([curses], [tputs], [LIBS="$LIBS -lcurses"],
+		[AC_CHECK_LIB([ncurses], [tputs])])
+	AC_CHECK_LIB([readline], [readline])
 
-	AC_SEARCH_LIBS(add_history, history,
-		AC_DEFINE(HAVE_ADD_HISTORY, 1, [Define if you have the add_history function])
+	AC_SEARCH_LIBS([add_history], [history],
+		AC_DEFINE([HAVE_ADD_HISTORY], [1], [Define if you have the add_history function])
 	)
 
-	AC_CHECK_HEADERS(history.h readline/history.h readline.h readline/readline.h)
+	AC_CHECK_HEADERS([history.h readline/history.h readline.h readline/readline.h])
 
 	# Check for rl_completion_matches as in readline 4.2
-	AC_CHECK_FUNCS(rl_completion_matches)
-	
+	AC_CHECK_FUNCS([rl_completion_matches])
+
 	msg_readline="enabled"
-else
+], [
 	msg_readline="disabled"
-fi
-
-])
-
+])])
-- 
2.44.0