how to solve pbuilder-satisfydepends-dummy dependencies?

Hello,
my pbuilder aborts with the following message:

fakeroot is already the newest version.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 pbuilder-satisfydepends-dummy : Depends: debhelper (>= 7) but it is not going to be installed
                                 Depends: python-support (>= 0.6) but it is not installable
                                 Depends: python-setuptools but it is not going to be installed
                                 Depends: python-numpy (>= 1:1.4.0) but it is not going to be installed
                                 Depends: python-scipy but it is not installable
                                 Depends: python-nose but it is not going to be installed
                                 Depends: python-matplotlib but it is not installable
                                 Depends: python-sphinx (>= 1.0.6) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
I: Copying back the cached apt archive contents
I: unmounting /var/cache/pbuilder/ccache filesystem

I am using this control file:
http://bazaar.launchpad.net/~pythonxy/pythonxy/scikits.statsmodels_debian_current/view/head:/control

What is wrong?

What do i need to do in order to make the builder process flow?

Thanks in advance. Help is really appreciated!