Could someone give me a pointer here:
Trying to add packages to my plasma environment like this:
```
services.xserver.desktopManager =
  { plasma5.enable = true;
     plasma5.extraPackages =
       with pkgs;
       [ redshift
         redshift-plasma-applet
         plasma-nm
         plasma-pa
         yakuake
       ];
  };
```
but it gives me this error:
`attribute ‘unwrapped’ missing, at /nix/store/pd4klfv2vzwll1fdgd3zpw41mcapg5gh-nixos-17.09pre106801.207a0af06a/nixos/pkgs/build-support/kde/wrapper.nix:8:52`
and after lots of searching and reading I can't seem to figure it out.