anchor.diff:    '';
   
     doInstallCheck = with stdenv; hostPlatform == buildPlatform;
  -  installCheckInputs = [ cmocka which cacert lua.cqueues lua.basexx ];
  +  installCheckInputs = [ cmocka which cacert lua.cqueues lua.basexx lua.http ];
     installCheckPhase = ''
       meson test --print-errorlogs
     '';
  
positive.code: , runCommand, pkgconfig, meson, ninja, makeWrapper
  # build+runtime deps.
  , knot-dns, luajitPackages, libuv, gnutls, lmdb, systemd, dns-root-data
  # test-only deps.
  , cmocka, which, cacert
  , extraFeatures ? false /* catch-all if defaults aren't enough */
  
negative.code:   # http://knot-resolver.readthedocs.io/en/latest/build.html#requirements
    buildInputs = [ knot-dns lua.lua libuv gnutls lmdb ]
      ++ optional stdenv.isLinux systemd # passing sockets, sd_notify
      ++ [ nghttp2 ]
      ## optional dependencies; TODO: libedit, dnstap
      ;
  
  