Prevent removal of configured files after Portfile change

[Simon Ruderich]

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Emmanuel Hainry wrote:
> When I have to tweak with the configure arguments or build
> environment, I do that manually instead of relying on port: going
> inside the build dir and trying configure, make, even make install
> (with special prefix) in order to get a working process. Only after
> that do I write the Portfile and try trace mode to check for
> dependencies. There is no use in writing a portfile for something you
> are not sure will compile... Unless if you are able to guess
> everything in two tries and write patchfiles directly.
> 
> Emmanuel

I'm using this approach too, but after I got it working with configure,
make, make install it sometimes doesn't work with macports instantly;
there are still some additional information (for example to configure)
necessary. And it speeds me up, when macports isn't removing the hole
directory (but thanks to Yves I know now how to prevent this).

Thanks for your help,
Simon
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