Howto make one Debian package out of 2 source tar.gz?

[frank@kuesterei.ch (Frank Küster)]

Hi,

inspired by a question on debian-user-german I have compiled the program
molmol on my woody machine, which was not trivial, but also not too
hard. Now I'd like to build a Debian package and offer it to other
people interested (or to the Debian non-free, if I find a sponsor and
the authors agree, but that's a question far in the future).

The program is distributed as two tar.gz files, molmol-2k.2.0-src.tar.gz
and molmol-2k.2.0-doc.tar.gz. However they have to make one Debian
Package (or at least be mixed), since after compilation everything that
comes out of the src.tar.gz is the single binary, whereas manpages,
internal menu files and so on are in the doc.tar.gz.

What is the right way (or where can I read it in the Developers
reference or policy, if I just missed the section) to make a Debian
package out of that? Should I first mangle the two to produce one
"faked" orig.tar.gz, or is there some magic I can do to dpkg-source or
dpkg-buildpackage to produce one Package and diff.gz from the two?

TIA, Frank
-- 
Frank Küster, Biozentrum der Univ. Basel
Abt. Biophysikalische Chemie