Temporary fix for bug 2494 - Crashes due to the non thread-safe SDL_malloc/SDL_free on Windows We'll define USE_LOCKS as a temporary fix until an alternative like ptmalloc, jemalloc, or nedmalloc can be investigated. http://www.malloc.de/en/ http://www.canonware.com/jemalloc/ http://www.nedprod.com/programs/portable/nedmalloc/ SDL allocates memory very infrequently, so this is probably a decent fix for a while.