From 1a663d9efc4df763b908d7f405efe9b70bfe7955 Mon Sep 17 00:00:00 2001
From: Charles Pigott <charlespigott@googlemail.com>
Date: Sun, 3 Mar 2019 16:54:04 +0000
Subject: [PATCH] Fix: Wrong variable was used in zlib detection

---
 config.lib | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/config.lib b/config.lib
index 1c3fc2c94e..5312636c4c 100644
--- a/config.lib
+++ b/config.lib
@@ -820,7 +820,7 @@ check_params() {
 	pre_detect_with_zlib=$with_zlib
 	detect_zlib
 
-	if [ "$with_zlib" = "0" ] || [ -z "$zlib-config" ]; then
+	if [ "$with_zlib" = "0" ] || [ -z "$zlib_config" ]; then
 		log 1 "WARNING: zlib was not detected or disabled"
 		log 1 "WARNING: OpenTTD doesn't require zlib, but it does mean that many features"
 		log 1 "WARNING: (like loading most old savegames/scenarios, loading heightmaps,"