lablgtk & optional buildlinking

[David Holland <dholland-pkgtech%netbsd.org@localhost>]

So, it seems that lablgtk's bl3 file needs to include gnome-panel's
bl3 file. This fixes the build of monotone-viz and I think some other
ocaml-related packages that fail linking -lnspr4.

The problem is, gnome-panel is optional in lablgtk. How (if at all) is
one supposed to put optional things in a package's bl3 file? Is there
a recommended way to work around this type of situation?

-- 
David A. Holland
dholland%netbsd.org@localhost