diff -r 8a773ea36eb6 -r 385ca6f76feb src/music/qtmidi.cpp
--- a/src/music/qtmidi.cpp	Sun Nov 25 12:58:32 2007 +0000
+++ b/src/music/qtmidi.cpp	Sun Nov 25 14:43:16 2007 +0000
@@ -19,6 +19,9 @@
  */
 
 
+#define MAC_OS_X_VERSION_MIN_REQUIRED    MAC_OS_X_VERSION_10_3
+#include <AvailabilityMacros.h>
+
 /*
  * OpenTTD includes.
  */