these 3 derivations will be built:
  /nix/store/8fm2xihsjvicylx3panws9l34rr0nfiq-source.drv
  /nix/store/fsrxjjajhyr2755ldz4g5v82fgs8d4fp-computecpp-2.3.0.drv
  /nix/store/c1sv5l3jw85d6zdyc32692clfd2h89zi-computecpp-wrapper-2.3.0.drv
these 3 paths will be fetched (1.5 MiB download, 20.5 MiB unpacked):
  /nix/store/jywlzydgd80saf963v7ghj3sdf0n7ssf-compiler-rt-libc-11.1.0
  /nix/store/0qakzc7qk0xn2njr9pzx8ylvs63n0vmg-compiler-rt-libc-11.1.0-dev
  /nix/store/7klam6mdw9cqa1jaj5xadfi0psk61y9x-install-shell-files
building '/nix/store/r37zdhwa2rpvmw5n8ppkh3ga1l2fshzi-source.drv'
source> 
source> trying https://computecpp.codeplay.com/downloads/computecpp-ce/2.3.0/x86_64-linux-gnu.tar.gz
source>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
source>                                  Dload  Upload   Total   Spent    Left  Speed
source>   0  9379    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
source> curl: (22) The requested URL returned error: 404
source> error: cannot download source from any mirror
error: Cannot build '/nix/store/r37zdhwa2rpvmw5n8ppkh3ga1l2fshzi-source.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/gmwqw454r0c96qbyn5nljyy07g4hc68p-source
       Last 7 log lines:
       >
       > trying https://computecpp.codeplay.com/downloads/computecpp-ce/2.3.0/x86_64-linux-gnu.tar.gz
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0  9379    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
       > curl: (22) The requested URL returned error: 404
       > error: cannot download source from any mirror
       For full logs, run:
         nix log /nix/store/r37zdhwa2rpvmw5n8ppkh3ga1l2fshzi-source.drv
error: build of resolved derivation '/nix/store/r37zdhwa2rpvmw5n8ppkh3ga1l2fshzi-source.drv' failed
error: Cannot build '/nix/store/fsrxjjajhyr2755ldz4g5v82fgs8d4fp-computecpp-2.3.0.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/5pjjfm3bmq6y7gglwzw95jl2dbc4pd8n-computecpp-2.3.0
error: Cannot build '/nix/store/c1sv5l3jw85d6zdyc32692clfd2h89zi-computecpp-wrapper-2.3.0.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/0iapkdxljv6a9wxh8sh7pbhdw5w0waj4-computecpp-wrapper-2.3.0