[Development] Compiling Qt5 Alpha on Linux fails

[Rohan McGovern]

marius.storm-olsen at nokia.com said:
> Try following the instructions here
>     http://qt-project.org/wiki/Qt-5-Alpha-building-instructions
> 
> Qt should not be configured in such a way that it needs to be installed. That's not a supported build configuration for the alpha.
> Only in-source non-install builds for alpha.
> 

If we only support in-source non-install builds for now, what was the
reason for adding that "build" script?