Appending to options with the `extra-` prefix was added in Nix 2.4, which makes config validation fail on this version without the guard. Change-Id: Ie253978dbaf00b228fecc08698a3dcc01cd2d82b
Appending to options with the `extra-` prefix was added in Nix 2.4, which makes config validation fail on this version without the guard. Change-Id: Ie253978dbaf00b228fecc08698a3dcc01cd2d82b