Some progress: I found Pluckers port/home page (=?), oss.kernelconcepts.de and there a quite hidden info that Plucker Reader for 770 needs two (!!) files, plucker
itself and libsglite-library-file!
Voilá, now Plucker launches but but but I cannot open any pdb-file for reading, Pluckers library function is not working.
Do I need some library file more?
The info for _ordinary users_ seems to be surprisingly hidden and complicated.