GNUstep use of clean room implementations

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Just a short comment about Chameleon.  If it is truly a clean room implementation
as the website says, you should be able to use it on any platform.  This has always
been my understanding of the idea of clean room development.  Perhaps I have been
misinformed.  I would welcome any comments (examples would be helpful) to help me
form a corrrect understanding should my thinking be incorrect.
 
Thanks
 
 
reference:
 
http://chameleonproject.org/

This new framework is a clean room implementation of the work done by Apple for iOS.
...............
Since Chameleon relies heavily on Core Animation, a proprietary technology owned by
Apple, it can not be used on other platforms such as Android or Windows. It only allows
iOS apps to be ported to the Mac.