How do I check what is autobuilding successfully?

[Jan Stary]

On Apr 25 14:44:51, ryandesign at macports.org wrote:
> 
> On Apr 25, 2018, at 14:26, Perry E. Metzger wrote:
> 
> > So the package in question is "rethinkdb",
> 
> > packages.macports.org doesn't seem to show the package there. Does
> > that mean it indeed hasn't built in a long time?
> 
> In this case, it means rethinkdb is not distributable.

wat makes a package distributable (or not)?