diff -up xblast-2.10.4/cfg_control.h~ xblast-2.10.4/cfg_control.h
--- xblast-2.10.4/cfg_control.h~	2006-02-09 22:21:23.000000000 +0100
+++ xblast-2.10.4/cfg_control.h	2020-02-19 22:48:34.041292637 +0100
@@ -29,7 +29,7 @@
 #define NUM_KEYB_CONTROLS  2
 
 /* constant assignment of control to event type */
-const XBEventCode keyEventType[NUM_KEYB_CONTROLS];
+extern const XBEventCode keyEventType[NUM_KEYB_CONTROLS];
 
 /* ingame controls for editing*/
 typedef struct
diff -up xblast-2.10.4/network.h~ xblast-2.10.4/network.h
--- xblast-2.10.4/network.h~	2006-02-10 16:07:42.000000000 +0100
+++ xblast-2.10.4/network.h	2020-02-17 23:47:58.022504923 +0100
@@ -105,7 +105,7 @@ typedef enum
 #define TEAM_UNDEF 252
 
 /* team color assignment */
-const XBColor teamColors[NUM_XBTS];
+extern const XBColor teamColors[NUM_XBTS];
 
 /* results of game config receive/create */
 typedef enum