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Configuring the Build

Some aspects of a Spectrum build can be customised using a build configuration file. By default, this configuration file should be called config.nix and located in the root of the Spectrum source tree, but this can be overridden by setting spectrum-config in the NIX_PATH to the path of the configuration file.

The configuration file should contain an attribute set. The only currently allowed attribute name is pkgs, which allows using a custom Nixpkgs to evaluate Spectrum.

config.nix to build Spectrum with a Nixpkgs overlay
  pkgs = import <nixpkgs> {
    overlays = [
      (final: super: {
        weston = super.weston.overrideAttrs ({ patches ? [], ... }: {
          patches = patches ++ [