Partial build log
this derivation will be built:
/nix/store/xil96x68lj0b0ar55nkgbmnisi3135n8-source.drv
building '/nix/store/z18vzg1afp9pxw5fl9cy01rjfn389h3i-source.drv'...
source> trying https://xyne.archlinux.ca/projects/python3-threaded_servers/src/python3-threaded_servers-2018.6.tar.xz
source> % Total % Received % Xferd Average Speed Time Time Time Current
source> Dload Upload Total Spent Left Speed
source> 100 16875 0 16875 0 0 35449 0 --:--:-- --:--:-- --:--:-- 35526
source> unpacking source archive /build/python3-threaded_servers-2018.6.tar.xz
source> xz: (stdin): File format not recognized
source> tar: This does not look like a tar archive
source> tar: Exiting with failure status due to previous errors
source> do not know how to unpack source archive /build/python3-threaded_servers-2018.6.tar.xz
error: builder for '/nix/store/z18vzg1afp9pxw5fl9cy01rjfn389h3i-source.drv' failed with exit code 1
error: