these 2 derivations will be built:
  /nix/store/0wndhbkslrj1a9q35ffyxgz26zzxb23l-generate-dependency-diagram.drv
  /nix/store/gycmlg4ppis7cy9cqj3bafrk66mh93km-check-dependency-diagram.drv
building '/nix/store/0wndhbkslrj1a9q35ffyxgz26zzxb23l-generate-dependency-diagram.drv'
generate-dependency-diagram> tribuchet: building on jamie
building '/nix/store/gycmlg4ppis7cy9cqj3bafrk66mh93km-check-dependency-diagram.drv'
check-dependency-diagram> tribuchet: building on jamie
error: Cannot build '/nix/store/gycmlg4ppis7cy9cqj3bafrk66mh93km-check-dependency-diagram.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/xj9mpg6kiml9i5w1i1zx2dannvjakylk-check-dependency-diagram
       Last 1 log lines:
       > tribuchet: building on jamie
       For full logs, run:
         nix log /nix/store/gycmlg4ppis7cy9cqj3bafrk66mh93km-check-dependency-diagram.drv