these 2 derivations will be built:
  /nix/store/0qa3a8bx42i4xsbnxi688hvfyd6k98iw-edukai-4.0.drv
  /nix/store/z0qs31rmmxmiys3qmgif9rl2vjys0r9w-edukai-4.0.drv
error: Cannot build '/nix/store/prw1vadddqljd0lm1qs10lkjbbxygcmc-edukai-4.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/agrmp8b0igvr088bqciv19p6cykz1pwg-edukai-4.0
       Last 16 log lines:
       >
       > trying http://language.moe.gov.tw/001/Upload/Files/site_content/M0001/edukai-4.0.zip
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0     0    0     0    0     0      0      0 --:--:--  0:02:13 --:--:--     0
       > curl: (28) Failed to connect to language.moe.gov.tw port 80 after 133084 ms: Couldn't connect to server
       > Warning: Problem : timeout. Will retry in 1 seconds. 3 retries left.
       >   0     0    0     0    0     0      0      0 --:--:--  0:02:14 --:--:--     0
       > curl: (28) Failed to connect to language.moe.gov.tw port 80 after 134165 ms: Couldn't connect to server
       > Warning: Problem : timeout. Will retry in 2 seconds. 2 retries left.
       >   0     0    0     0    0     0      0      0 --:--:--  0:02:13 --:--:--     0
       > curl: (28) Failed to connect to language.moe.gov.tw port 80 after 133095 ms: Couldn't connect to server
       > Warning: Problem : timeout. Will retry in 4 seconds. 1 retries left.
       >   0     0    0     0    0     0      0      0 --:--:--  0:02:15 --:--:--     0
       > curl: (28) Failed to connect to language.moe.gov.tw port 80 after 135248 ms: Couldn't connect to server
       > error: cannot download edukai-4.0 from any mirror
       For full logs, run:
         nix log /nix/store/prw1vadddqljd0lm1qs10lkjbbxygcmc-edukai-4.0.drv
error: build of resolved derivation '/nix/store/prw1vadddqljd0lm1qs10lkjbbxygcmc-edukai-4.0.drv' failed
error: Cannot build '/nix/store/z0qs31rmmxmiys3qmgif9rl2vjys0r9w-edukai-4.0.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/c378zgwfr11qvhwny8hckw7l4m6adfri-edukai-4.0