these 2 derivations will be built:
  /nix/store/sdbynkqd83h3wp8v7q6m6z6a6vvglcfs-edusong-1.0.drv
  /nix/store/fiss3ivllflfxyrdyqcypipb7hrl20qn-edusong-1.0.drv
error: Cannot build '/nix/store/wcf9ky10b49vvz5rdygzblr7577x7cgi-edusong-1.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/kngsh71wpdq48pdxflmbhbwd4xab1hk2-edusong-1.0
       Last 16 log lines:
       >
       > trying http://language.moe.gov.tw/001/Upload/Files/site_content/M0001/eduSong_Unicode.zip
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0     0    0     0    0     0      0      0 --:--:--  0:02:15 --:--:--     0
       > curl: (28) Failed to connect to language.moe.gov.tw port 80 after 135349 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 134152 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 133159 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 edusong-1.0 from any mirror
       For full logs, run:
         nix log /nix/store/wcf9ky10b49vvz5rdygzblr7577x7cgi-edusong-1.0.drv
error: build of resolved derivation '/nix/store/wcf9ky10b49vvz5rdygzblr7577x7cgi-edusong-1.0.drv' failed
error: Cannot build '/nix/store/fiss3ivllflfxyrdyqcypipb7hrl20qn-edusong-1.0.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/y413mz4rdlw2z1jy30xarzgxbilbg51v-edusong-1.0