Index: configure
===================================================================
--- configure   (revision 11193)
+++ configure   (working copy)
@@ -3300,6 +3300,14 @@
     echo "         need to run ./configure with --enable-proc-opt   "
 fi

+if test x"$mmx" = x"no" -a "$cpu" = "x86" ; then
+    echo
+    echo "WARNING: MMX appears to be disabled on an x86 CPU."
+    echo "         It is likely that this will be too slow for video"
+    echo "         playback.   "
+fi
+
+
 echo # add a newline after any warnings.

 if test x"$mmx" = x"yes"; then