--- a/hedgewars/SDLh.pas	Fri Sep 29 19:31:25 2017 +0200
+++ b/hedgewars/SDLh.pas	Fri Sep 29 22:06:29 2017 +0200
@@ -77,6 +77,9 @@
 /////////////////////  CONSTANT DEFINITIONS /////////////////////
 /////////////////////////////////////////////////////////////////
 
+    SDL_FALSE = 0;
+    SDL_TRUE = 1;
+
     // SDL_Init() flags
     SDL_INIT_TIMER          = $00000001;
     SDL_INIT_AUDIO          = $00000010;