anchor.diff:  { config, lib, pkgs, ... }:
   
   let
  -  inherit (lib) mkDefault mkEnableOption mkIf mkOption mkRemovedOptionModule types;
  +  inherit (lib) mkBefore mkDefault mkEnableOption mkIf mkOption mkRemovedOptionModule types;
     inherit (lib) concatStringsSep literalExample mapAttrsToList;
     inherit (lib) optional optionalAttrs optionalString;
   
  
positive.code:   '';
  
    configurationYml = format.generate "configuration.yml" cfg.settings;
  
    additionalEnvironment = pkgs.writeText "additional_environment.rb" ''
      config.logger = Logger.new("${cfg.stateDir}/log/production.log", 14, 1048576)
      config.logger.level = Logger::INFO
  
      ${cfg.extraEnv}
    '';
  
    unpackTheme = unpack "theme";
    unpackPlugin = unpack "plugin";
  
negative.code:         scm_darcs_command = "${pkgs.darcs}/bin/darcs";
        };
      };
  
      services.redmine.extraEnv = mkBefore ''
        config.logger = Logger.new("${cfg.stateDir}/log/production.log", 14, 1048576)
        config.logger.level = Logger::INFO
      '';
  
      services.mysql = mkIf mysqlLocal {
        enable = true;
  