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FROGGS / Alien-SDL-1.440 / patches / SDL-1.2.14-video_mmx.patch 
--- SDL-1.2.14/src/video/mmx.h	2009-10-13 01:07:15.000000000 +0200
+++ SDL-1.2.14/src/video/mmx.h	2011-06-29 16:36:00.000000000 +0200
@@ -355,7 +355,7 @@
 
 #define	mmx_r2m(op, reg, mem) \
 	__asm__ __volatile__ (#op " %%" #reg ", %0" \
-			      : "=X" (mem) \
+			      : "=m" (mem) \
 			      : /* nothing */ )
 
 #define	mmx_r2r(op, regs, regd) \