Additionally, you can also add a file from a path with:

environment.etc = { somerc.source = /etc/somerc; }; 

Or a directory:

environment.etc = { aDir.source = ./aDir; }; 

Additionally, you can also add a file from a path with:

environment.etc = { somerc.source = /etc/somerc; }; 

Or a directory:

environment.etc = { aDir.source = ./aDir; }; 

Or a package path:

environment.etc = { "X11/xorg.conf.d/90-super.conf".source = "${pkgs.displayfix}/share/displayfix/data/90-super.conf"; };