development packages

[djh]

Forgive my ignorance, but I did read the chapter for managing packages
and it explained up to boffo being an application and a library
(external source usage), but I didn't see any reference to what
exactly goes into the packages with "....-devel" names..

I can only think about header files needed for compiling.

Is there any documentation around for how to handle/create the
<packag-name>"-devel" packages?

Thanks
  Darel