Description
Currently we can specify basic installation directories such as docdir libdir and such.
At exherbo, eveything arch-related go inside /usr/<arch> and everything not arch-related goes directly nside /usr.
Setting prefix to /usr/<arch> and then docdir to /usr/share/doc makes it mostly work, but cargo installs its completion inside /usr/<arch>/etc/ and /usr/<arch>/share which we don't want.
I have some work in progress here and there for adding support for bindir and sysconfdir. This would allow us to set prefix to /usr and sysconfdir to /etc (which I actually made the default as this is probably what most people want, it's currently in prefix/etc).
Update of the installer submodule is missing in my rust branch as I was waiting for the pull request to get merged before doing so.