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)...