Overriding /tmp/distfiles for specific ports

[Glen Barber]

Howdy,

I'm working on automating port builds, and I've come across a situation
that I haven't yet been able to find a solution.  One of the ports I
maintain requires java/openjdk6, which you have to fetch manually.  That's
no problem, and I have the proper bzip'd file available.  The problem is
that I can't find a clear way to override the 'fetch' process from looking
in /tmp/disfiles to look in /usr/ports/distfiles where I have the Caffe
distribution from FreeBSDFoundation.org.

I could very well be overthinking this, and I'd prefer not to make a
global change which would affect other ports I intend to regularly build.

Unfortunately, the only thing Google has returned in my searches were
other public Tinderboxes with "${FOO} doesn't seem to exist in
/tmp/distfiles", which is making my searching around more difficult.

Any insight would be appreciated.

Regards,

-- 
Glen Barber