--- a/physfs_platforms.h	Wed Mar 14 06:39:17 2007 +0000
+++ b/physfs_platforms.h	Wed Mar 14 07:20:59 2007 +0000
@@ -26,7 +26,7 @@
 #  define PHYSFS_PLATFORM_UNIX
 #  define PHYSFS_PLATFORM_POSIX
 #elif defined(macintosh)
-#  define PHYSFS_PLATFORM_MACCLASSIC
+#  error Classic Mac OS support was dropped from PhysicsFS 2.0. Move to OS X.
 #elif defined(unix)
 #  define PHYSFS_PLATFORM_UNIX
 #  define PHYSFS_PLATFORM_POSIX