> Thanks for sending out this proposal. I admit I’m somewhat ignorant of the 
> current state of SwiftPM so feel free to point me at existing resources if 
> I’m missing basic things.
> 
> You don’t cover it in your proposal, but does this mean pkg-config is now a 
> dependency for SwiftPM? I may be mistaken but it doesn’t seem as though 
> pkg-config is installed on the base OS X system. (This leads me to assume 
> it’s an optional dependency.)

This is a good point, I’ll revise the proposal.

My intentions were: if available, use it, if not, then things may not build. 
Long term we could parse pkg-config files ourselves since the format is very 
basic which would be preferable since “your package graph *may* or *may not* 
build” is hardly fun.

> Your proposal suggests the set of supported package mangers will be closed. 
> What about folks using new, or non-standard package managers?

They can add their package manager to the supported list via a Pull Request.

> What about packages that are installed system-wide without a package manager 
> (e.g. with ./configure && make && make install)? 

Such packages should come with a .pc file.

> This may be covered elsewhere, but about the case of a C package that is 
> normally system-wide but is currently being hacked on by the user? (For 
> example to while debugging it, or writing bindings for it.)

There is no convenient way to do this at this time, but proposals are welcome. 
It *is* possible currently, you can make a local module map package that 
encapsulates the C library, or if it is simple enough our C-target support may 
be sufficient.

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