[darwinbuild-dev] How do I add to include path?

[Brian Wagener]

I am trying developing on MacOS for the first time, and downloaded darwinbuild.  I am trying to
build smb which depends on UserNotification.  So I downloaded each one, and I got USerNotification
to build, but when I try to build smb, it fails that it cannot find the UserNotification headers. 
How do I get this to work?
Thanks,
Brian