anchor.diff:      owner = "openucx";
       repo = "ucx";
       rev = "v${version}";
  -    sha256 = "0p126wd8xd7x1fwc78hqmaaykyxyn8kpxd69i549d5c9w2a75j8y";
  +    sha256 = "149p8s7jrg7pbbq0hw0qm8va119bsl19q4scgk94vjqliyc1s33h";
     };
   
     nativeBuildInputs = [ autoconf automake libtool doxygen ];
   
     buildInputs = [ numactl rdma-core libbfd libiberty perl zlib ];
   
  -  configureFlags = [ "--with-rdmacm=${rdma-core}" ]
  -    ++ stdenv.lib.optionals enableOpt  [
  +  configureFlags = [
  +    "--with-rdmacm=${rdma-core}"
  +    "--with-dc"
  +    "--with-rc"
  +    "--with-dm"
  +    "--with-verbs=${rdma-core}"
  +  ] ++ stdenv.lib.optionals enableOpt  [
         "--with-avx"
         "--with-sse41"
         "--with-sse42"
  
positive.code:     homepage = http://www.openucx.org;
      license = licenses.bsd3;
      platforms = platforms.linux;
    };
  }
  
  
negative.code: } :
  
  let
    version = "1.7.0";
  
  in stdenv.mkDerivation {
    name = "ucx-${version}";
  