these 6 derivations will be built:
  /nix/store/rgbym4gxbdmgw1dxhpr4mlk2iqprwr43-shelfmark-1.3.9.drv
  /nix/store/7pfycc4215kfg8d725msr2k4b9cqi07p-unit-shelfmark.service.drv
  /nix/store/yn9pndfb18i2dmyp8m967c8gq8c9j9d0-system-units.drv
  /nix/store/pxxk4lxwhvyyw44jbpkl0nngh9g165a8-etc.drv
  /nix/store/azm0pmap5yzrsfd0yf28cbzgaqwaw1xk-activate.drv
  /nix/store/hr6m4kjix2wsvya6zc25fcbxclhari0i-nixos-system-marvin-26.11.19800101.f165e44.drv