patch for force fetch

[Diane Bruce]

On Mon, May 16, 2011 at 10:02:57AM +0300, Andriy Gapon wrote:
> 
> I've noticed the following problem.
> If a distfile is updated by a distributor without renaming it (so that checksum
> and possibly size change), then more often than not the port build system would
> fail to fetch the distfile.

I've run into this myself and simply done the manual rm -f. This looks like
a great addition.


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