macports registry error when runtime dependency installed but not active

[Jeremy Lavergne]

>> Got a full log with the backtrace? The error may not even be coming from
>> base. Dependencies are installed before any target is executed in any
>> case, and runtime dependencies aren't required to be present at
>> configure time.
> 
> I ran clean/upgrade a few times; there error itself was not part of the log.
> It only showed up in stdout/stderr (didn’t check which)...

Also note that it’s not an immediate dependency, but a dependency of a dependency.