It's FAQ.

Why bother with the Yet Another thing, while there is Perl-Tk and plenty of others?

Prima was started on OS/2, where Tk didn't really run. We have had two options - either port Tk, or write something on our own, probably better than the existing tools. We believe that we've succeeded.

...

But I want to use Prima in another language.

Unless your language has runtime binding with perl, you cannot.