Dovecot Update Fails to Build in CI, Trace Mode

[Steven Smith]

> I don't see bison listed as a build dependency in that port.

Doh! It’s kind of obvious now that you say it. Thank you.

This looks like a difference between:

> $ /usr/bin/bison --version
> bison (GNU Bison) 2.3
> 
> $ /opt/local/bin/bison --version
> bison (GNU Bison) 3.7.5


If you don’t mind, I have a tangential Portfile question:

The dovecot build downloads several text files from https://dovecot.org/ <https://dovecot.org/> using wget. (For some reason this doesn’t break trace mode). Is it preferred to just let the project’s Makefiles invoke wget, or add these explicitly into the port fetch distfiles with their own master_sites and checksums?
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