these 6 derivations will be built:
  /nix/store/616i2ilgkfzhr5a0f3x9rq26l795kwxj-source.drv
  /nix/store/l5clqq70szrk56zlnpysrmwyxyhq1qp4-ccusage-20.0.30-vendor-staging.drv
  /nix/store/0qrfq0djrdnb14hsbn4ckivkx508gn8z-ccusage-20.0.30-vendor.drv
  /nix/store/qd98wqv9j8bd7ncvn4p92qhpsg0cyfd2-model_prices_and_context_window.json.drv
  /nix/store/isp7z2jlc7hlx94y7lsfmnm2j3ybcvvs-ccusage-20.0.30.drv
  /nix/store/iprll4qyk4vz0f5szhh4mxgzi1wlfc5p-check-ccusage.drv