nixpkgs/pkgs/stdenv/mingw/simple-stdenv/default.nix

# Here we construct an absolutely trivial `initial' standard
# environment.  It's not actually a functional stdenv, since there is
# not necessarily a working C compiler.  We need this to build
# gcc-wrapper et al. for the native stdenv.

{system, name, shell, path, extraEnv ? {}}:

let {
  body = 
    derivation {
      inherit system name;
      initialPath = path;
      builder = shell;
      args = ["-e" ./builder.sh];
    }

    // {
      mkDerivation = attrs:
        derivation ((removeAttrs attrs ["meta"]) // {
          builder = shell;
          args = ["-e" attrs.builder];
          stdenv = body;
          system = body.system;
        }

        // extraEnv);

      inherit shell;
    };
}