Mac OS X builds

[Nathan Scott <nathans@xxxxxxxxxx>]

Hi Ken,

Just some notes from recent build updates I found I needed for
Mac OS X.  Previously Makepkgs failed, configure failed, then
the libpcp build check-statics failed - these are fixed up now.

We'll permanently need the following additions to a stock Mac
install, for building on OS X:

- XCode  (as always, needs an Apple developer ID now too)
- Auxillary Tools for XCode  (for packagemaker)
- MacPorts.org  (now needed for pkg-config, gnutar)
- Qt  (install and set QTDIR, as before)

Not sure if there's a spot we keep these kinds of notes?  It
doesn't look like INSTALL is the right place, that's more end-
user focussed.

cheers.

--
Nathan