these 3 derivations will be built:
  /nix/store/mz6azaajg1b0p0ai338a4k22dyp683w4-omp-18.12.6-cargo-vendor-vendor.drv
  /nix/store/xcr1y32dnqcw8dxjsqwamr0aqgjgf080-omp-18.12.6.drv
  /nix/store/sm3xgd1wgwwsvlinj8q0rq13zs931hya-check-omp.drv
error: gRPC QueryValidPaths on 'farm.numtide.com:50051' failed: error: substituter 'https://cache.numtide.com' is disabled
error: Cannot build '/nix/store/mz6azaajg1b0p0ai338a4k22dyp683w4-omp-18.12.6-cargo-vendor-vendor.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/wrhp4vz81yfx05dxijp6kbl0qbyd037s-omp-18.12.6-cargo-vendor-vendor
error: Cannot build '/nix/store/xcr1y32dnqcw8dxjsqwamr0aqgjgf080-omp-18.12.6.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/k6l9zyv0nny9xl5gr0qlryzmipd2wabb-omp-18.12.6
error: Cannot build '/nix/store/sm3xgd1wgwwsvlinj8q0rq13zs931hya-check-omp.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/a6ss3xpkhb7ppqk5jycxrlql590271j0-check-omp