diff --git a/src/thread/pthread/SDL_sysmutex.c b/src/thread/pthread/SDL_sysmutex.c index 4284fa9bf..cc2d75632 100644 --- a/src/thread/pthread/SDL_sysmutex.c +++ b/src/thread/pthread/SDL_sysmutex.c @@ -21,6 +21,7 @@ */ #include "SDL_config.h" +#define _GNU_SOURCE #include #include "SDL_thread.h"