anchor.diff:    soext = if stdenv.system == "x86_64-darwin" then "dylib" else "so";
   
   in stdenv.mkDerivation rec {
  -  version = "0.26.0";
  +  version = "0.27.1";
     name = "mesos-${version}";
   
  +  enableParallelBuilding = true;
     dontDisableStatic = true;
   
     src = fetchurl {
       url = "mirror://apache/mesos/${version}/${name}.tar.gz";
  -    sha256 = "0csvaql9gky15w23gmiw6cvlfnrlhfxvdqd2pv3j3grr44ph0ab5";
  +    sha256 = "147iq7vwi09kqblx1h8r6lkrg9g50i257qk1cph1zr5j3rncz7l8";
     };
   
     patches = [
  
positive.code:     rm -f "$out/lib/${python.libPrefix}"/site-packages/site.py*
      popd
  
      # optional python dependency for mesos cli 
      pushd src/python/cli
      ${python}/bin/${python.executable} setup.py install \
        --install-lib=$out/lib/${python.libPrefix}/site-packages \
  
negative.code: { stdenv, lib, makeWrapper, fetchurl, curl, sasl, openssh, autoconf
  , automake115x, libtool, unzip, gnutar, jdk, maven, python, wrapPython
  , setuptools, boto, pythonProtobuf, apr, subversion, gzip, systemd
  , leveldb, glog, perf, utillinux, libnl, iproute, openssl, libevent
  , bash
  }:
  
  let
  