anchor.diff:  
     config = mkIf cfg.enable {
   
  -    environment.systemPackages = [pkgs.openafsClient];
  +    environment.systemPackages = [ openafsPkgs ];
   
       environment.etc = [
         { source = afsConfig;
  
positive.code:     cp ${cellServDB} $out/CellServDB
      echo "/afs:${cfg.cacheDirectory}:${cfg.cacheSize}" > $out/cacheinfo
    '';
  in
  {
    ###### interface
  
negative.code: 	preStart = ''
  	  mkdir -m 0755 /afs || true
  	  mkdir -m 0755 -p ${cfg.cacheDirectory} || true
            ${pkgs.module_init_tools}/sbin/insmod ${openafsPkgs}/lib/openafs/libafs-*.ko || true
            ${openafsPkgs}/sbin/afsd -confdir ${afsConfig} -cachedir ${cfg.cacheDirectory} -dynroot -fakestat
  	'';
  
  	postStop = ''
  	  umount /afs
            ${openafsPkgs}/sbin/afsd -shutdown
  	  rmmod libafs
  	'';
  
  