G++ bug

[Martin v. Loewis]

> Problem: GCC can not distinct 'typedef unsigned int
> Rgb' from 'char *' in overloaded constructor when
> argument is 'Rgb(0)'.

Thanks for your bug report. This is a well-known problem, please see
http://egcs.cygnus.com/bugs.html (Parse errors for "simple" code).

In your case, the work-around is to write

  QColorGroup q( (0,QColor(QRgb(0))) );

Hope this helps,
Martin