--- a/QTfrontend/CMakeLists.txt	Thu Nov 23 21:03:05 2006 +0000
+++ b/QTfrontend/CMakeLists.txt	Thu Nov 23 21:03:11 2006 +0000
@@ -8,7 +8,11 @@
 	set(HEDGEWARS_BINDIR ".")
 else(WIN32 AND NOT UNIX)
 	set(HEDGEWARS_BINDIR ${CMAKE_INSTALL_PREFIX})
-	set(HEDGEWARS_DATADIR ${DATA_INSTALL_DIR})
+	if(DEFINED ${DATA_INSTALL_DIR})
+		set(HEDGEWARS_DATADIR ${DATA_INSTALL_DIR})
+	else(DEFINED ${DATA_INSTALL_DIR})
+		set(HEDGEWARS_DATADIR ${CMAKE_INSTALL_PREFIX}/share/)
+	endif(DEFINED ${DATA_INSTALL_DIR})
 endif(WIN32 AND NOT UNIX)
 
 configure_file(${hedgewars_SOURCE_DIR}/QTfrontend/main.cpp.in