Partial build log
this derivation will be built:
/nix/store/z7bz582w7vdhvpz5qrdhzbjn18b4m6ri-source.drv
building '/nix/store/z7bz582w7vdhvpz5qrdhzbjn18b4m6ri-source.drv'...
source> trying https://github.com/bombela/backward-cpp/archive/v1.6.tar.gz
source> % Total % Received % Xferd Average Speed Time Time Time Current
source> Dload Upload Total Spent Left Speed
source> 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
source> 100 194k 0 194k 0 0 521k 0 --:--:-- --:--:-- --:--:-- 10.3M
source> unpacking source archive /build/v1.6.tar.gz