{
  config,
  lib,
  pkgs,
  this,
  ...
}:
with lib;
{
  config = mkIf this.isHeadful {
    documentation = {
      dev.enable = true;
      nixos.enable = true;

      man.man-db.manualPages =
        (pkgs.buildEnv {
          name = "man-paths";
          paths = with config; environment.systemPackages ++ hm.home.packages;
          pathsToLink = [ "/share/man" ];
          extraOutputsToInstall = [ "man" ];
          ignoreCollisions = true;
        }).overrideAttrs
          (_: _: { __contentAddressed = true; });
    };

    environment.sessionVariables = {
      MANOPT = "--no-hyphenation";
      MANPAGER = "${getExe pkgs.less} -+F";
    };
  };
}