anchor.diff:  , fetchurl
   , alsa-lib
   , dbus
  +, ell
   , glib
   , json_c
   , libical
  
positive.code:   buildInputs = [
      alsa-lib
      dbus
      glib
      json_c
      libical
  
negative.code:     "--enable-library"
      "--enable-cups"
      "--enable-pie"
      "--enable-external-ell"
      "--with-dbusconfdir=${placeholder "out"}/share"
      "--with-dbussystembusdir=${placeholder "out"}/share/dbus-1/system-services"
      "--with-dbussessionbusdir=${placeholder "out"}/share/dbus-1/services"
  