_: {
  perSystem =
    {
      pkgs,
      self',
      lib,
      ...
    }:
    with lib;
    {
      devShells = {
        default = pkgs.mkShell {
          packages = [

            pkgs.blockdiag
            pkgs.nwdiag
            pkgs.seqdiag
            pkgs.actdiag

            pkgs.lessc

            pkgs.pandoc

            pkgs.go-task

            pkgs.zola
            pkgs.sass
            #(pkgs.writers.writeBashBin "publish" ''
            #  ${getExe pkgs.go-task} publish
            #'')
            (pkgs.writers.writeBashBin "serve" ''
              ${getExe pkgs.go-task} serve
            '')

          ];
        };
      };
    };
}