https://github.com/robbat2/readahead-list/pull/1

From f0f32adfb4eaf26e33fc1655a22a529961257db9 Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sun, 25 Dec 2022 20:38:01 +0000
Subject: [PATCH 4/6] filelist-order.cxx: Add missing <cstdlib> include for
 exit()

Signed-off-by: Sam James <sam@gentoo.org>
--- a/src/filelist-order.cxx
+++ b/src/filelist-order.cxx
@@ -17,6 +17,7 @@
 
 #include <../config.h>
 
+#include <cstdlib>
 #include <map>
 #include <set>
 #include <iostream>
-- 
2.39.0