these 4 derivations will be built:
  /nix/store/vd6mjap99lqkciva6ab4x6y054mmh7hn-mfcl8690cdwlpr-1.3.0-0.i386.deb.drv
  /nix/store/9fh6lhlann8liacpzk5qd9f860c2h3wk-mfcl8690cdwlpr-1.3.0-0.drv
  /nix/store/jzxq19bx9zhv9n69yd7fism0qdzyd1p8-mfcl8690cdwcupswrapper-1.4.0-0.i386.deb.drv
  /nix/store/y2sa6wc09ysgdysmcga21q6zrjcy0rhr-mfcl8690cdwcupswrapper-1.4.0-0.drv
building '/nix/store/sxyrwbwq42sgpy4c7f2hdznvnf5jh81d-mfcl8690cdwcupswrapper-1.4.0-0.i386.deb.drv'
building '/nix/store/angwwd5fgs33xqv24y0d9rjnj08qiwh7-mfcl8690cdwlpr-1.3.0-0.i386.deb.drv'
mfcl8690cdwcupswrapper-1.4.0-0.i386.deb> 
mfcl8690cdwcupswrapper-1.4.0-0.i386.deb> trying http://download.brother.com/welcome/dlf103250/mfcl8690cdwcupswrapper-1.4.0-0.i386.deb
mfcl8690cdwcupswrapper-1.4.0-0.i386.deb>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
mfcl8690cdwcupswrapper-1.4.0-0.i386.deb>                                  Dload  Upload   Total   Spent    Left  Speed
mfcl8690cdwlpr-1.3.0-0.i386.deb> 
mfcl8690cdwlpr-1.3.0-0.i386.deb> trying http://download.brother.com/welcome/dlf103241/mfcl8690cdwlpr-1.3.0-0.i386.deb
mfcl8690cdwlpr-1.3.0-0.i386.deb>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
mfcl8690cdwlpr-1.3.0-0.i386.deb>                                  Dload  Upload   Total   Spent    Left  Speed
mfcl8690cdwcupswrapper-1.4.0-0.i386.deb>   0    10    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
mfcl8690cdwcupswrapper-1.4.0-0.i386.deb> curl: (22) The requested URL returned error: 404
mfcl8690cdwcupswrapper-1.4.0-0.i386.deb> error: cannot download mfcl8690cdwcupswrapper-1.4.0-0.i386.deb from any mirror
error: Cannot build '/nix/store/sxyrwbwq42sgpy4c7f2hdznvnf5jh81d-mfcl8690cdwcupswrapper-1.4.0-0.i386.deb.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/ifa0lmpn2a95p6prvsd7snw35adhsjsk-mfcl8690cdwcupswrapper-1.4.0-0.i386.deb
       Last 7 log lines:
       >
       > trying http://download.brother.com/welcome/dlf103250/mfcl8690cdwcupswrapper-1.4.0-0.i386.deb
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0    10    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
       > curl: (22) The requested URL returned error: 404
       > error: cannot download mfcl8690cdwcupswrapper-1.4.0-0.i386.deb from any mirror
       For full logs, run:
         nix log /nix/store/sxyrwbwq42sgpy4c7f2hdznvnf5jh81d-mfcl8690cdwcupswrapper-1.4.0-0.i386.deb.drv
error: build of resolved derivation '/nix/store/sxyrwbwq42sgpy4c7f2hdznvnf5jh81d-mfcl8690cdwcupswrapper-1.4.0-0.i386.deb.drv' failed
mfcl8690cdwlpr-1.3.0-0.i386.deb>   0    10    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
mfcl8690cdwlpr-1.3.0-0.i386.deb> curl: (22) The requested URL returned error: 404
mfcl8690cdwlpr-1.3.0-0.i386.deb> error: cannot download mfcl8690cdwlpr-1.3.0-0.i386.deb from any mirror
error: Cannot build '/nix/store/angwwd5fgs33xqv24y0d9rjnj08qiwh7-mfcl8690cdwlpr-1.3.0-0.i386.deb.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/5c038r17m7z6gz7hfbncz1l08vxy4hfl-mfcl8690cdwlpr-1.3.0-0.i386.deb
       Last 7 log lines:
       >
       > trying http://download.brother.com/welcome/dlf103241/mfcl8690cdwlpr-1.3.0-0.i386.deb
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0    10    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
       > curl: (22) The requested URL returned error: 404
       > error: cannot download mfcl8690cdwlpr-1.3.0-0.i386.deb from any mirror
       For full logs, run:
         nix log /nix/store/angwwd5fgs33xqv24y0d9rjnj08qiwh7-mfcl8690cdwlpr-1.3.0-0.i386.deb.drv
error: build of resolved derivation '/nix/store/angwwd5fgs33xqv24y0d9rjnj08qiwh7-mfcl8690cdwlpr-1.3.0-0.i386.deb.drv' failed
error: Cannot build '/nix/store/9fh6lhlann8liacpzk5qd9f860c2h3wk-mfcl8690cdwlpr-1.3.0-0.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/3cmzhd972kvkm0zil6lhyhz8lyxhllnp-mfcl8690cdwlpr-1.3.0-0
error: Cannot build '/nix/store/y2sa6wc09ysgdysmcga21q6zrjcy0rhr-mfcl8690cdwcupswrapper-1.4.0-0.drv'.
       Reason: 2 dependencies failed.
       Output paths:
         /nix/store/7d48g70i1nwb4prdbviran35w2r1065a-mfcl8690cdwcupswrapper-1.4.0-0