[pierreozoux]

Thanks for the pointer. I've been thinking about this kind of scheme: - using a vanilla gentoo - install portage - emerge my package - at the end, do a diff of the filesystem to apply it to the vanilla gentoo.

And using docker filesytem feature for that. I'm still quiete new to Docker and don't know if it is easy to do.

But I'll have a look to gentoo-bb, I think it is exactly what I need!