pkg-plist help for a perl library

[George Hartzell]

I'm working on an updated biology/p5-bioperl-devel (for the 1.5
release) and the bioperl-run package.

There are several cases where they install files into the same
directory (e.g. %%SITE_PERL%%/Bio/Factory/).

What's the right way to handle removing the directory.  @dirrm doesn't
seem to do the right thing (depending on whether the other ports got
stuff down there or not...).

Thanks,

g.