these 3 derivations will be built:
  /nix/store/hb6zxgm7dn3yyqaamwjbwr97jzl8gzxg-source.drv
  /nix/store/1bdxy5vq509p4kxgw55yhhb5spnj8daz-harmonia-deps-3.3.0.drv
  /nix/store/ij62cf5jk5lnwjxkmvwm1h60pd3lahhb-harmonia-3.3.0.drv