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diff -up dosbox-0.74/src/gui/sdlmain.cpp.orig dosbox-0.74/src/gui/sdlmain.cpp
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--- dosbox-0.74/src/gui/sdlmain.cpp.orig	2013-12-18 15:06:41.227839719 +0100
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+++ dosbox-0.74/src/gui/sdlmain.cpp	2013-12-18 15:07:14.434769053 +0100
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@@ -1529,7 +1529,7 @@ static void show_warning(char const * co
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 	if ( !sdl.inited && SDL_Init(SDL_INIT_VIDEO|SDL_INIT_NOPARACHUTE) < 0 ) textonly = true;
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 	sdl.inited = true;
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 #endif
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-	printf(message);
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+	printf("%s", message);
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 	if(textonly) return;
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 	if(!sdl.surface) sdl.surface = SDL_SetVideoMode(640,400,0,0);
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 	if(!sdl.surface) return;