Thanks for the answer, but I found what I searched for:

in the HP-UX FAQ:

ftp://rtfm.mit.edu/pub/faqs/hp/hpux-faq

I found the hint to search at:

ftp://interworks.org/pub/comp.hp/X11R6/

and there they are: libraries, headers (and binaries) compiled with
HP-UX 9.05 for HP9000/s700 workstations.
I compiled espgs (to use my new printer with HP-UX) with X-support and
it worked like a charm.

Johannes

Johannes Raspe wrote:

> Hi,
>
> does anybody know where to get the X-header files for HP-UX 10.20?
> For 11.00 they're in the developers toolkit, which doesn't exist for
> 10.20.
> Any ideas welcome!
>
> Johannes