package is not going to be installed

[Anil Duggirala <anilduggirala@fastmail.fm>]

I believe I have the versions required by dependency available in my
active repositories, (including wheezy-backports), but package manager
says they will not be installed. why?
this is the output from console:

>> Some packages could not be installed. This may mean that you have
 requested an impossible situation or if you are using the unstable 
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 python-qt4 : Depends: libqt4-declarative (>= 4:4.8.0-1~) but it is not
 going to be installed
              Depends: libqt4-designer (>= 4:4.8.0-1~) but it is not
              going to be installed
              Depends: libqt4-help (>= 4:4.8.0-1~) but it is not going
              to be installed
              Depends: libqt4-script (>= 4:4.8.0-1~) but it is not going
              to be installed
              Depends: libqt4-scripttools (>= 4:4.8.0-1~) but it is not
              going to be installed
              Depends: libqt4-svg (>= 4:4.8.0-1~) but it is not going to
              be installed
              Depends: libqt4-test (>= 4:4.8.0-1~) but it is not going
              to be installed
              Depends: libqt4-xmlpatterns (>= 4:4.8.0-1~) but it is not
              going to be installed