this derivation will be built:
  /nix/store/a8dkcwdhncc7nvzgm6qq5w0jv9k00bdm-gufo-0-unstable-ae7ef25.drv
building '/nix/store/a8dkcwdhncc7nvzgm6qq5w0jv9k00bdm-gufo-0-unstable-ae7ef25.drv'...
/nix/store/3nvg5dqnww7zf0w05dc9clvy5dbigy3b-gufo-0-unstable-ae7ef25
