these 4 derivations will be built:
  /nix/store/2xyk82cjc03zwrn6snxcrjysgki2g26g-source.drv
  /nix/store/q2d0cdm8r1v94ryi1ac2i3vmy9nl1pkm-aven-0.1.30-vendor-staging.drv
  /nix/store/x1y3xr3cb5kilrfa4sv31i0zgsjdk3pr-aven-0.1.30-vendor.drv
  /nix/store/ajixnz3zb6al80zdy5bp4rai8516q4vj-aven-0.1.30.drv