Updated Mac build instructions

[Dirk Hohndel]

On Fri, Dec 26, 2014 at 11:35:41AM +0100, Robert C. Helling wrote:
> Henrik,
> 
> 
> 
> > Am 26.12.2014 um 11:02 schrieb Henrik Brautaset Aronsen <subsurface at henrik.synth.no>:
> > 
> > I updated the build instructions on the web page awhile ago,
> 
> Do those really work for you? For me qt5 from homebrew is "keg only" i.e. Does not link files not to interfere wit qt4. Even 
> 
> brew link --force qt5
> 
> Leaves my system in an unusable mess. So I gave up on qt5 from homebrew and compiled it manually. 

I gave up on homebrew ages ago. It causes way more problems than it
solves, especially when trying to ship binaries

/D