I found that the following changes seem to be needed for pango,
Xft2, gst-plugins0.10-good, bug-buddy, and x11-links to work on
Ubuntu 8.04, and probably other newer Linux systems. I'm no
expert on these packages, so I'm unsure of the correctness of
my changes.
The gst-plugins0.10-good and bug-buddy changes look like
no-brainers: adding PLIST entries for files not installed on
NetBSD. But, maybe not?
All the other changes, I'm less sure about. I made each one in
reaction to a missing pkg-config file during build, e.g. xcb and
pthread-stubs.