From 40e4869f69a511e4cfb7a00fd62edf2fe4866294 Mon Sep 17 00:00:00 2001
From: Gaeel Bradshaw <gaeel.bradshaw@goto-games.com>
Date: Sun, 15 Aug 2021 13:15:33 +0200
Subject: [PATCH] build: use pkg-config to find correct libpng version

as recommended by this StackOverflow answer: https://stackoverflow.com/a/30981965
---
 CMakeLists.txt | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 362fa58..f457b20 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,21 @@ cmake_minimum_required(VERSION 2.8.12)
 project(MINEDMAP CXX)
 
 
-find_package(PNG REQUIRED)
+# search for pkg-config
+include (FindPkgConfig)
+if (NOT PKG_CONFIG_FOUND)
+    message (FATAL_ERROR "pkg-config not found")
+endif ()
+
+# check for libpng
+pkg_check_modules (LIBPNG libpng16 REQUIRED)
+if (NOT LIBPNG_FOUND)
+    message(FATAL_ERROR "You don't seem to have libpng16 development libraries installed")
+else ()
+    include_directories (${LIBPNG_INCLUDE_DIRS})
+    link_directories (${LIBPNG_LIBRARY_DIRS})
+    link_libraries (${LIBPNG_LIBRARIES})
+endif ()
 find_package(ZLIB REQUIRED)