dpkg stopping with an error

["J.F.Gratton" <j.f.gratton@videotron.ca>]

Hello, I'm trying to compile Firestarter 0.7.1 on a Debian (unstable) 
system. After I got most of the dependencies correctly, I still needed one 
package to be installed, which is libgnomeprint11


Everytime I try to install this package, dpkg returns this:

Setting up libgnomeprint11 (0.25-ximian.6) ...
dpkg: error processing libgnomeprint11 (--configure):
subprocess post-installation script returned error exit status 1

I don't know much on how dpkg works so right now I'm stumped (especially 
since this package is needed by many others !).

What can I do to correct the situation ?

Please : don't come up with "don't use Ximian" or "switch to Debian/stable" 
.. I want to keep my environment as it is; if I have to modify some scripts 
into the package so be it, I'll do it, but I don't want any solutions that 
make me "rollback" my environment :)

Thanks to everyone :)

Jeff