http://www.sunrisetel.net/software/papers/modula2/Modula2.xclangspec
Note that this doesn't make Xcode associate .def and .mod file name
suffixes with Modula-2, which requires a different specification file
and which I haven't been able to get working yet.
I use jed when editing Modula-2 source. Works fine to me...
http://modula2.net/resources/Modula2.xclangspec
The old URL at sunrise is being redirected to the new one, but if you
have linked to this file on your website, please update the link
accordingly, thanks.