For Okular one needs more or less poppler, this requires again fontconfig and freetype.
Thanks to Pino, poppler has a cmake based buildsystem, fontconfig got one as well and today I finished freetype. So what should I say - fontconfig doesn't build yet under msvc, but I am currently at it.
Freetype works now though - and I think that was the major problem until now.
So look forward to a package release of kdegraphics soon.