diff -r 9b34679fda8b -r 77d6336711fc include/SDL_config_os2.h
--- a/include/SDL_config_os2.h	Tue Jun 09 15:45:33 2009 +0000
+++ b/include/SDL_config_os2.h	Tue Jun 09 17:33:44 2009 +0000
@@ -38,6 +38,7 @@
 typedef signed long long int64_t;
 typedef unsigned long long uint64_t;
 
+#define SIZEOF_VOIDP 4
 #define SDL_HAS_64BIT_TYPE	1
 
 /* Use Watcom's LIBC */