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The +waf+ file has its own library compressed in a binary stream in the same file. Upon execution, the library is uncompressed in a hidden folder in the current directory. The folder will be re-created if removed. This scheme enables different Waf versions to be executed from the same folders:
NOTE: The binary file requires http://docs.python.org/library/bz2.html[bzip2] compression support, which may be unavailable in some self-compiled cPython installations.
In the next sections of the book, we assume that either an alias or the execution path have been set in a way that +waf+ may be called directly.