flex duel rule

gframe/game.h

@@ -741,7 +741,9 @@ extern HostInfo game_info;
 #define TEXTURE_ATTACK				5
 #define TEXTURE_ACTIVATE			6
 
+#ifndef DEFAULT_DUEL_RULE
 #define DEFAULT_DUEL_RULE			4
+#endif
 
 #define CARD_ARTWORK_VERSIONS_OFFSET	10
 #endif // GAME_H

gframe/premake4.lua

@@ -4,6 +4,8 @@ project "ygopro"
     kind "ConsoleApp"
 	
     defines { "YGOPRO_SERVER_MODE" }
+    local mr=os.getenv("YGOPRO_DEFAULT_DUEL_RULE")
+    if mr and tonumber(mr) then defines { "DEFAULT_DUEL_RULE="..tonumber(mr) } end
 
     files { "gframe.cpp", "config.h",
             "game.cpp", "game.h",