Description of problem:
qmake-qt4 seems not compile correctly some qt-plugins on 64bits arch

Version-Release number of selected component (if applicable):
[eponyme@FEDOBOX ~]$ rpm -qf /usr/lib/qt4/bin/qmake-qt4 
qt-devel-4.4.3-6.fc10.i386
[eponyme@FEDOBOX ~]$ qmake-qt4 -v
QMake version 2.01a
Using Qt version 4.4.3 in /usr/lib64

How reproducible:
(I'm sorry, the application (monkeystudio) concerned is quite long to compile :(  )

Steps to Reproduce:
1. On a x86_64 machine :
 Install compilation dependancies :
 # yum install qt-devel qscintilla-devel
2. download the application :
   $ wget http://monkeystudio.googlecode.com/files/mks_1.8.3.0-svn2673-src.tar.gz
   untar it
3. $ qmake-qt4
   $ make
   $ qmake-qt4 (called again to update install procedure with plugins generated)
   # make install

4. Launch the application in a terminal
   $ monkeystudio
  
Actual results:
Some errors will appear, telling for each plugin that it was impossible to load.
The application will the be launched. In "plugins > manage" menu, no plugin will be listed.
It seems that it's because plugins are compiled in 32bits. This trick will avoid this bug :
qmake-qt4 -spec /usr/lib64/qt4/mkspecs/linux-g++ (after calling make)

Expected results:
At launch, all plugins installed must be loaded properly. When application is launched, the dialog box opened with "plugins > manage" must list all loaded plugins.

Additional info:
It only appears on 64bits arch (only tested on x86_64, not on ppc64). 
Tested on other distributions (ubuntu, opensuse, debien) : this bug does not appear