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pyobjc / pyobjc-framework-ScreenSaver / Doc / api-notes-ScreenSaver.txt

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File pyobjc-framework-ScreenSaver/Doc/api-notes-ScreenSaver.txt

 that a screen saver must contain compiled C code for the correct
 architectures. 
 
+On Mac OS X 10.6 and Mac OS X 10.7 you cannot use PyObjC to write a screen saver
+because the screen saver engine uses Objetive-C Garbage Collection and
+that is not supported by PyObjC. 
+
+Screen savers work again in OS X 10.8.
+
 For OSX 10.6 or later on Intel CPUs the binary must contain support
 for the x86_64 (64-bit Intel) code, on earlier OSX releases support
 for i386 (32-bit Intel) is needed.