ok, so i've dug through sdl to figure out how it initializes the pfd, and similar things, and try these settings:

SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 0 );  //Changed!
    SDL_GL_SetAttribute( SDL_GL_BUFFER_SIZE, 32); //Added!
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 ); //Changed!
    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    if ( fsaa ) {
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 );
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, fsaa );
    }
    if ( accel ) {
	    SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 );
    }
    if ( sync ) {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 );
    } else {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 0 );
    }
    if ( SDL_SetVideoMode( w, h, bpp, video_flags ) == NULL ) {
	    fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
	    SDL_Quit();
	    exit(1);
    }

their is one other thing i'm curiose about, after looking through the code, but let's try this first.
also, sorry about the late response.

ok, so i've dug through sdl to figure out how it initializes the pfd, and similar things, and try these settings:

SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 0 );  //Changed!
    SDL_GL_SetAttribute( SDL_GL_BUFFER_SIZE, 32); //Added!
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 ); //Changed!
    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    if ( fsaa ) {
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 );
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, fsaa );
    }
    if ( accel ) {
	    SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 );
    }
    if ( sync ) {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 );
    } else {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 0 );
    }
    if ( SDL_SetVideoMode( w, h, bpp, video_flags ) == NULL ) {
	    fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
	    SDL_Quit();
	    exit(1);
    }

their is one other thing i'm curiose about, after looking through the code, but let's try this first.
also, sorry about the late response.

ok, so i've dug through sdl to figure out how it initializes the pfd, and similar things, and try these settings:

SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 0 );  /Changed!
    SDL_GL_SetAttribute( SDL_GL_BUFFER_SIZE, 32); //Added!
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 ); //Changed!
    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    if ( fsaa ) {
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 );
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, fsaa );
    }
    if ( accel ) {
	    SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 );
    }
    if ( sync ) {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 );
    } else {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 0 );
    }
    if ( SDL_SetVideoMode( w, h, bpp, video_flags ) == NULL ) {
	    fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
	    SDL_Quit();
	    exit(1);
    }

their is one other thing i'm curiose about, after looking through the code, but let's try this first.
also, sorry about the late response.