these 2 derivations will be built:
  /nix/store/ijqgc07q3s1xbbzlc7b2j1p3c6jjkhl0-edukai-4.0.drv
  /nix/store/ycc3a7vp9xspmbbd7szf7rxydk0s6czc-edukai-4.0.drv
error: Cannot build '/nix/store/7vp4wgig7m00l26hd753p0a0pg1mynl0-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 --:--:--  0:02:16 --:--:--     0
       > curl: (28) Failed to connect to language.moe.gov.tw port 80 after 136517 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 134136 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 133122 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 135259 ms: Couldn't connect to server
       > error: cannot download edukai-4.0 from any mirror
       For full logs, run:
         nix log /nix/store/7vp4wgig7m00l26hd753p0a0pg1mynl0-edukai-4.0.drv
error: build of resolved derivation '/nix/store/7vp4wgig7m00l26hd753p0a0pg1mynl0-edukai-4.0.drv' failed
error: Cannot build '/nix/store/ycc3a7vp9xspmbbd7szf7rxydk0s6czc-edukai-4.0.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/wnm781wxr5yrg9j4pz07hx9crhzam9h8-edukai-4.0