anchor.diff:      ceph = {
         buildInputs = [ yajl ];
       };
  -    cgroups = {};
  -    chrony = {};
  -    conntrack = {};
  -    contextswitch = {};
  -    cpu = {};
  -    cpufreq = {};
  -    cpusleep = {};
  -    csv = {};
       curl = {
         buildInputs = [ curl ];
       };
  
positive.code:       buildInputs = [ libvirt libxml2 yajl ] ++
          lib.optionals stdenv.isLinux [ lvm2 udev ];
      };
      vmem = {};
      vserver = {};
      wireless = {};
      write_graphite = {};
      write_http = {
        buildInputs = [ curl yajl ];
      };
  
negative.code:     dns = {
        buildInputs = [ libpcap ];
      };
      ipmi = {
        buildInputs = [ openipmi ];
      };
  