I'm the Debian libupnp4 maintainer, so not directly responsible for the
Ubuntu package but maybe I can help you.

Libupnp 1.8 is a major API change in order to hide more of the internal
implementation, which is why it is packaged as a different library
(libupnp4) than version 1.6 (libupnp3).  I am keeping both packages in
Debian until I can help the dependent packages such as vlc perform a
transition to the new API.  Presumably Ubuntu will do the same.

The non-definition of "struct s_UpnpDiscovery *" and similar types is
apparently deliberate by upstream, because some (*coughwindows*)
compilers cannot cope with empty structs such as "struct {}
s_UpnpDiscovery *".  In the external API the type is only ever used via
pointers, and it is cast to a real struct internally.  Although it looks
odd, I have found that the code does compile cleanly on gcc.

I have looked into what's needed to adapt vlc and other clients to the
new API. If you mail me at n...@leverton.org I'll be happy to discuss
with you.  I hope to be able to get the transition started for Debian
once Squeeze is released.

A newer version of libupnp4 (svn20090323-1) should be entering Debian
soon and may be worth a look for Ubuntu too.

-- 
Package not backwards compatible and seems broken
https://bugs.launchpad.net/bugs/493321
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