these 2 derivations will be built:
  /nix/store/rf7z8cr8n0d9lh77a78pfs6s59flqhn7-generate-dependency-diagram.drv
  /nix/store/817xh0950n6a06rqhs3wbxg3d6llsy1k-check-dependency-diagram.drv
building '/nix/store/rf7z8cr8n0d9lh77a78pfs6s59flqhn7-generate-dependency-diagram.drv'
generate-dependency-diagram> tribuchet: building on jamie