diff -Nrua old/src/m_misc.c src/src/m_misc.c
--- old/src/m_misc.c	2009-11-09 17:43:02.000000000 +0100
+++ src/src/m_misc.c	2009-11-09 17:45:34.000000000 +0100
@@ -71,6 +71,8 @@
 #include "r_demo.h"
 #include "r_fps.h"
 
+#define DISABLE_DOUBLEBUFFER
+
 /* cph - disk icon not implemented */
 static inline void I_BeginRead(void) {}
 static inline void I_EndRead(void) {}