Partial build log
this derivation will be built:
/nix/store/bg08x2y6wf8ij38pck302libhsn17ymp-source.drv
building '/nix/store/bg08x2y6wf8ij38pck302libhsn17ymp-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 17155 0 17155 0 0 68307 0 --:--:-- --:--:-- --:--:-- 68620
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/bg08x2y6wf8ij38pck302libhsn17ymp-source.drv' failed with exit code 1