> Which is very unwanted on the other hand, since it is so sticky, i.e. will 
> have to be increased forever once it has been added to a port file, right?!
> So, it's best to find a way around epoch!

Apart from reinstalling very large packages, are there reasons to avoid 
rebuilding on any change rather than just checking epoch_version_revision?

If it should be more manual perhaps a commit hook that incremented a set 
variable to provide a linear change count. I'm thinking if it must be linear, 
perhaps revision can be made into this: version is human-readable while 
revision is for port to determine if a change has occurred.

If it doesn't need to be linear then we could just use a hash of the Portfile 
to track if anything changed. Anything at all.

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