ROS

This guide is intended to be complementary to the official ROS Jade Installation Guide.

Prerequisites
ROS jade has an overlay that is currently being maintained by the ROS Organization found here.

You will need to set up the ROS Overlay. This removes the need for layman.

Then sync the overlay (future emerge --sync operations will do this automatically)

In system dependencies:

It is not recommended to use pip in Gentoo. A large effort was made to ensure that all dependencies for primarily supported OS's (e.g. Ubuntu) are also resolved for Gentoo. Core ROS packages can be installed from the overlay.

Installation
The instructions from the official guide can be followed from this point.