diff -U4 -r colobot-0.2.0--orig/test/unit/app/app_test.cpp colobot-0.2.0--patched/test/unit/app/app_test.cpp

--- colobot-0.2.0--orig/test/unit/app/app_test.cpp	2021-08-21 22:57:34.000000000 +0200

+++ colobot-0.2.0--patched/test/unit/app/app_test.cpp	2021-08-22 01:17:42.988409930 +0200

@@ -20,13 +20,14 @@

 #include "app/app.h"

 #include "common/make_unique.h"

-#include "common/system/system_other.h"

+#include "common/system/system_linux.h"

 #include <functional>

 #include <memory>

+#include <SDL.h>

 #include <gtest/gtest.h>

 #include <hippomocks.h>

 using namespace HippoMocks;