Create list of ports to update

[Carmel NY]

Reading up on "poudriere", it appears that I have to feed it a list of ports 
that need to be updated. Unlike "synth" which can figure that out by itself, 
it does seem counterproductive.

My question, now that "portmaster" is apparently dead in the water, what is 
the easiest way to construct a list of ports that need updating in the: 
"port-category/port-name" format?

-- 
Carmel
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