portfile question concerning optional deps

[Joshua Root]

On 2011-3-4 10:02 , Daniel J. Luke wrote:
> ... and just to note why I care:
> 
> It would be useful at some point to be able to differentiate between ports that need a library or ports that need an executable binary that is provided by another port (think about library ABI changes).

Knowing whether a port actually links with each dependency is also
important for arch checking and license compliance (with binaries).
However I'm not clear on how the change you're proposing will help with
that.

- Josh