Add pkg-config file to make it easier for other projects to use libmonome?

[simonvanderveldt]

Would it be an option to add writing of a libmonome.pc pkg-config file to the wscript?
That way it'll be a lot easier for other projects to automatically find libmonome and use it with their build tool of choice.

Seems like there's a built-in option to waf to do this called subst_pc

See for an example the JACK2 wscript