> In other words, if Gentoo ships Gnome3, then these .typelib files must have
> been packaged and installed somewhere.
> Unfortunately I don't know Gentoo well enough to tell you how to look for them.
Gentoo is a meta distribution, meaning it provides mechanisms and tools to manage dependencies and a good QA scheme to ensure stability, but packages are compiled on your own systems based on your own requirement. The big added value is you got a system optimized for your hardware and containing only what you're looking for : a big boost compared to other distributions on my old hardware (it's the same with NetBSD's pkgsrc for
The drawback is you got only what you requested, and in my case, I never care about introspection till now as I didn't have any need for it.
I checked on my system where I use LXDE : I got some .typelib files
nunux laurent # find /usr -name
and I guess it's only because I included some gnomeish tools. Unfortunately, no GTK, so I think I'll have to reinstall it