anchor.diff:      sensors = {
         buildInputs = lib.optionals stdenv.isLinux [ lm_sensors ];
       };
  -    serial = {};
       sigrok = {
         buildInputs = lib.optionals stdenv.isLinux [ libsigrok udev ];
       };
  
positive.code:     ceph = {
        buildInputs = [ yajl ];
      };
      cgroups = {};
      chrony = {};
      conntrack = {};
      contextswitch = {};
      cpu = {};
      cpufreq = {};
      cpusleep = {};
      csv = {};
      curl = {
        buildInputs = [ curl ];
      };
  
negative.code:       buildInputs = [ libvirt libxml2 yajl ] ++
          lib.optionals stdenv.isLinux [ lvm2 udev ];
      };
      write_http = {
        buildInputs = [ curl yajl ];
      };
  