these 4 derivations will be built:
  /nix/store/77dna3fq2gcrzddj1rycl21qsznajbqd-source.drv
  /nix/store/064d3vda89nz6whvlv1cqy3schfzfig4-unreal-agent-0.2.0-go-modules.drv
  /nix/store/hisv551nr5bvyj902gk8lx59d5liz8p3-unreal-agent-0.2.0.drv
  /nix/store/4v5nsrxrwia3kjl6mqcbj5hvqwxvs732-check-unreal-agent.drv