Where does waf configure save the working directory?

[Eric S. Raymond]

Hal Murray <hmurray at megapathdsl.net>:
> 
> ./waf configure --out=xxx
>   saves the xxx someplace.  Following waf builds or checks use that directory.
> 
> I'd like to have more than one directory in-progress at the same time and 
> switch to the desired one.  Is that possible?  How?

I don't know how to do this.  It is possible that looking at the output
of "./waf --help" might yield a clue.
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