Is there a way to check that other port have an option set?

[Andrey Chernov]

I mean, from the port's Makefile.
pkg info PORT_NAME + grep comes in mind, but it is not backward
compatible with pre-NG system (do we need to keep backward compatibility
now?) and I am not sure that it is the most right/light-weighted way.
Proper thing will be not to check other port and exit, if option is not
set, but rebuild other port with needed option only, added
automatically. Any ideas?

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