a way to specify that the port is source-only

[Yury Selivanov]

Hello all!

Is it possible to specify in the *Portfile* that this particular
port should be always compiled and never fetched precompiled?

Problem:

I have some ports patched and being distributed through the 
company's own portfile repo.  Let's say I have a custom
"postgresql91" port with our custom patches.  Now, on many
machines, instead of building it, it just downloads a pre-built
version.  Can we add an option in Portfiles, like 
     "source_only   yes" 
or something like that?

Thanks,
-
Yury