Index: crossfire-client-1.74.0/gtk-v2/src/main.h
===================================================================
--- crossfire-client-1.74.0.orig/gtk-v2/src/main.h	2020-07-25 22:03:39.570540805 +0300
+++ crossfire-client-1.74.0/gtk-v2/src/main.h	2020-07-25 22:28:48.440084499 +0300
@@ -34,7 +34,7 @@
 #define DIALOG_FILENAME CF_DATADIR "/ui/dialogs.ui"
 
 /** Path to the current UI file. */
-char window_xml_file[MAX_BUF];
+extern char window_xml_file[MAX_BUF];
 
 #define MAGIC_MAP_PAGE  1 /**< Notebook page of the magic map */
 
