I have a branch which adds in support for portage and emerge into Alire. I cannot debug this as it raises an exception reading the settings toml on a newline, 0x0a. I recreated my settings from scratch with alr and it still happens.
Also, when you ctrl-c the emerge I get an unhandled exception even though all are handled inside the Install subprogram like all the other package managers.
So, if anyone on gentoo wants to try it out, you’ll need to modify an external package in the following way.