this derivation will be built:
  /nix/store/c8wz151sng7ws2pki5y8xzc8waqv3nh5-ttf-envy-code-r-0.PR7.drv
building '/nix/store/y7i70hfn0pi460b7fnzssmprb2brkhib-ttf-envy-code-r-0.PR7.drv'
ttf-envy-code-r-0.PR7> 
ttf-envy-code-r-0.PR7> trying http://download.damieng.com/fonts/original/EnvyCodeR-PR7.zip
ttf-envy-code-r-0.PR7>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
ttf-envy-code-r-0.PR7>                                  Dload  Upload   Total   Spent    Left  Speed
ttf-envy-code-r-0.PR7>   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
ttf-envy-code-r-0.PR7> Warning: Problem : timeout. Will retry in 1 seconds. 3 retries left.
ttf-envy-code-r-0.PR7>   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
ttf-envy-code-r-0.PR7> Warning: Problem : timeout. Will retry in 2 seconds. 2 retries left.
ttf-envy-code-r-0.PR7>   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
ttf-envy-code-r-0.PR7> Warning: Problem : timeout. Will retry in 4 seconds. 1 retries left.
ttf-envy-code-r-0.PR7>   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
ttf-envy-code-r-0.PR7> error: cannot download ttf-envy-code-r-0.PR7 from any mirror
error: Cannot build '/nix/store/y7i70hfn0pi460b7fnzssmprb2brkhib-ttf-envy-code-r-0.PR7.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/xz9x212si8mvq0v7qz62mm7z2q0dkipg-ttf-envy-code-r-0.PR7
       Last 12 log lines:
       >
       > trying http://download.damieng.com/fonts/original/EnvyCodeR-PR7.zip
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
       > Warning: Problem : timeout. Will retry in 1 seconds. 3 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
       > Warning: Problem : timeout. Will retry in 2 seconds. 2 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
       > Warning: Problem : timeout. Will retry in 4 seconds. 1 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: download.damieng.com
       > error: cannot download ttf-envy-code-r-0.PR7 from any mirror
       For full logs, run:
         nix log /nix/store/y7i70hfn0pi460b7fnzssmprb2brkhib-ttf-envy-code-r-0.PR7.drv
error: build of resolved derivation '/nix/store/y7i70hfn0pi460b7fnzssmprb2brkhib-ttf-envy-code-r-0.PR7.drv' failed