Mac OSX installer downgraded QtGui

[Guy Gascoigne-Piggford]

I just installed Bazaar-2.3b4-OSX-10.6-1 and found that the Qt library
that I had installed was downgraded and as such broke my build of
kdiff3.  It's not particularly hard for me to fix, but is it really
necessary to overwrite a later version of the library?

dyld: Library not loaded: QtGui.framework/Versions/4/QtGui
  Referenced from: /Applications/kdiff3.app/Contents/MacOS/kdiff3
  Reason: Incompatible library version: kdiff3 requires version 4.7.0
or later, but QtGui provides version 4.6.0

That said, I really appreciate the work you take in providing easy OSX
installers, it makes my life much easier.

Guy