pkg_create: correct usage?

[mdff]

i'm trying to create packages on freebsd-5.4-RELEASE.

can anyone tell me how to define a packinglist for
pkg_create with the ability to remove the directories
after pkg_delete and not getting complaints if they are
not empty?

if i specify @dirrm <dir> in the packinglist, i get these
errors, if some packages share a specific directory:

# pkg_delete <packname>
> pkg_delete: unable to completely remove directory '/usr/local/lib'
> pkg_delete: couldn't entirely delete package (perhaps the packing
> list is incorrectly specified?)

br...