Install optional sage package (nauty) on archlinux tl;dr: how can I install optional sage packages on archlinux? Quoting the Arch wiki page for sage: > Most if not all of the standard sage packages are available as Arch packages and exposed as (optional) dependencies of sagemath, so there is no need to install them with `sage -i`. Alas, the (very) nauty package is an **optional** one, and so cannot be installed from with pacman. The error I get when trying the standard `sage -i nauty` (either with or without sudo) is /usr/bin/sage: line 297: ./sage: No such file or directory This is documented in the talk page (of the Arch Wiki) for Sage (as in "this happens"). That page does not discuss workarounds. So far I have been unable to find any reference or guidance in installing optional packages. Any reference would be warmly welcomed!

The command `pacman -Si sagemath` lists all optional dependencies for Sagemath available through pacman (see the archlinux wiki article, thanks Lahwaacz!).


$ pacman -Si sagemath
...
Optional Deps :
...
nauty: for generating some classes of graphs
...


So all that is needed is to install nauty: `sudo pacman -Syu nauty`, and you may run it to your heart's content (examples here).