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