--- a/config.h.cmake.orig	2022-11-04 11:48:52.235540654 +0100
+++ b/config.h.cmake	2022-11-04 11:49:34.018674547 +0100
@@ -103,7 +103,7 @@
 
 /* Path to data directory */
 #ifdef WITH_APPDIR_INSTALLATION
-#define OC_SYSTEM_DATA_DIR "../share/games/openclonk"
+#define OC_SYSTEM_DATA_DIR "${CMAKE_INSTALL_PREFIX}/share/openclonk"
 #else
 #define OC_SYSTEM_DATA_DIR "${CMAKE_INSTALL_PREFIX}/share/games/openclonk"
 #endif