Please add gpcl as package to Debian, probably as backport available for oder
releases, too. Building gpcl with the debian-directory from ghostscript yields
file overlaps, because of files both programs use. Diversions could be a
solution.

Maybe it could be a better idea to split gs into ghostscript-common and
ghostscript-gs-bin and ghostscript-gpcl-bin to prevent unnecessary disk space
allocation through duplicate files.

Quoting Patrik Schindler (2019-09-17 16:46:48)

I am a bit puzzled, however, why you file a sparate bugreport instead of
following up on bug#855219.  Would you agree that it makes sense to
merge #855219 into this one?

Oh, and btw: Any progress on your OS/400 project?

Kind regards,

 - Jonas