[Groff] How to embed fonts

[Rüdiger Härtel]

Hello,

I am searching for a way to embed fonts into ps-files produced with groff. 
Ghostscript can embed fonts when producing the pdf file with the flag
-dEmbedAllFonts=true.

But this is one step too late I think. I guess that I have to tell groff to 
embed the fonts into the ps file. 

At some place I found that 'includeres' will do the job but it requires the 
files named like the fonts e.g. Times-Roman ... 
Why do I need those files when the fonts TI TR ... are already there?

Any hints or pointers are welcome.

TIA,

        Rüdiger