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The .nixpkg file format is extended to optionally include the URL of a binary cache, which will be used in preference to the manifest URL (which can be set to a non-existent value).
Nix is a purely functional package manager. For installation and usage instructions, please read the manual, which can be found in `docs/manual/manual.html', and additionally at the Nix website at <http://nixos.org/>. Acknowledgments This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (http://www.OpenSSL.org/).