When running the program luvcview the following error is reported:

*** glibc detected *** free(): invalid next size (fast): 0x08066830 ***

On tracing it turns out to fail from SDL_WM_SetCaption()

On going through the function it looks like the SDL_free() function is called every alternate time with an invalid pointer that has already been freed.

To fix: remove the else in the statement.

Even better validate "title" and only if valid execute the code in the function.

The following is what I think the new code should look like... Please verify.

--- start new code ---
void
SDL_WM_SetCaption(const char *title, const char *icon)
{
    if (title) {
	if (wm_title) {
            SDL_free(wm_title);
        }

        wm_title = SDL_strdup(title);

    	SDL_SetWindowTitle(SDL_VideoWindow, wm_title);
    }
}
--- end new code ---