show port's deps

[Luke Dean]

>> Hi, how can i know what the dependencies are for a particular port?
> try:
> # make pretty-print-run-depends-list
>   - or -
> # make pretty-print-build-depends-list

Where do you guys find these interesting and useful make targets?

I've searched the manpages for make and make.conf and the Makefiles 
themselves, but I don't see anything like pretty-print-build-depends-list, 
yet it works.