diff --git a/unix.c b/unix.c
--- a/unix.c
+++ b/unix.c
@@ -39,6 +39,7 @@ ULONG __stack = (1024*1024)*2; // maybe 
 #endif
 
 #if defined(__APPLE__)
+#include <SDL.h>	//the mac implementation needs this file included in the same file as main()
 #include "os/macosx/macos.h"
 #endif