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The actual p4 command is open-source software released under the 2-clause BSD license, so we can build it here (for pretty much every architecture we support!) and include it in the cache. This change removes the server-side commands from this package, but they are now available as part of a separate p4d package instead. (The server package remains unfree.) As an added bonus, we can also include the libraries and headers for the C/C++ API, which will allow us to package any software that uses Perforce as a library in the future.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.