• built on NixOS
• /nix/store/jimsyp86zj0mpgq8zx1bqvnr6gsb0xa0-mbuffer-20181119/bin/mbuffer passed the binary check.
• 1 of 1 passed binary check by having a zero exit code.
• 0 of 1 passed binary check by having the new version present in output.
• found 20181119 with grep in /nix/store/jimsyp86zj0mpgq8zx1bqvnr6gsb0xa0-mbuffer-20181119
• directory tree listing: https://gist.github.com/334d6073f5c927881c5fe2a9ab7ed9f1
• du listing: https://gist.github.com/b731de02595c66b08fc16299c8620564

3 total rebuild path(s)

1 package rebuild(s)

1 x86_64-linux rebuild(s)
1 i686-linux rebuild(s)
0 x86_64-darwin rebuild(s)
1 aarch64-linux rebuild(s)

First fifty rebuilds by attrpath
mbuffer

Either download from Cachix:

nix-store -r /nix/store/jimsyp86zj0mpgq8zx1bqvnr6gsb0xa0-mbuffer-20181119 \
  --option binary-caches 'https://cache.nixos.org/ https://r-ryantm.cachix.org/' \
  --option trusted-public-keys '
  r-ryantm.cachix.org-1:gkUbLkouDAyvBdpBX0JOdIiD2/DP1ldF3Z3Y6Gqcc4c=
  cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
  '

(r-ryantm's Cachix cache is only trusted for this store-path realization.)

Or, build yourself:

nix-build -A mbuffer https://github.com/r-ryantm/nixpkgs/archive/922acf1cf95aaac075037eb3c0319b61dc8d5fb7.tar.gz

After you've downloaded or built it, look at the files and if there are any, run the binaries:

ls -la /nix/store/jimsyp86zj0mpgq8zx1bqvnr6gsb0xa0-mbuffer-20181119
ls -la /nix/store/jimsyp86zj0mpgq8zx1bqvnr6gsb0xa0-mbuffer-20181119/bin