From febb2928d1e72c7adc914b2ef8e0611e1a5ea3fd Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Thu, 6 Oct 2022 18:10:52 +0100
Subject: [PATCH] Fix implicit function declaration

Bug: https://bugs.gentoo.org/871231
--- a/src/arg_int.c
+++ b/src/arg_int.c
@@ -29,6 +29,7 @@ USA.
 /* #endif */
 
 #include "argtable2.h"
+#include <ctype.h>
 #include <limits.h>
 
 /* local error codes */