anchor.diff:      
             postgresql = {
               enable = true;
  -      
  +    	    enableTCPIP = true;
  +	    
               authentication = ''
                 # Generated file; do not edit!
  -              local all all              trust
  -              host  all all 127.0.0.1/32 trust
  -	      host  all all ::1/128      trust
  +              local all all                trust
  +              host  all all 127.0.0.1/32   trust
  +	      host  all all ::1/128        trust
  +	      host  all all 192.168.1.0/24 trust
               '';
             };
           };  
  
positive.code:         services = {
  	  xserver = {
  	    enable = true;
              driSupport = true;
  	  };
  	};
  	  
          environment = {
  	  extraPackages = [
  	    pkgs.firefox
  	    pkgs.icewm
  	    pkgs.scrot
  	  ];
  	};
  
negative.code:       {config, pkgs, ...}:
        {
          services = {
  	  portmap = {
  	    enable = true;
  	  };
  
            nfsKernel = {
              enable = true;
            };	  
    
            httpd = {
              enable = true;
  