[Newbies] Getting HPDF running

[Leo]

Hi,

I'm trying to build some PDF-Files from 
Squeak and stumbled over  the HPDF-
Framework, which seems to suit my purpose
 pretty well.

So I installed the FFI and HPDF packages
 and tried the tests. 
Since the ones for HPDF fail, I assume that
I have to use the libHaru Libraries and to 
combine them somehow with this FFI-thing...

...but actually I have no idea how to do that! :(
Could anybody give me some advice? 
Probably that's a dumb question, but I would 
enjoy Your answer nontheless. ;)

Best regards,
Leo