anchor.diff:        owner = "dlang";
         repo = "dub";
         rev = "v${version}";
  -      sha256 = "16r7x4jsfv5fjssvs6mwj8ymr6fjpvbkjhpr4f4368sjr5iyfad6";
  +      sha256 = "02xxpfcjs427jqbwz0vh5vl3bh62ys65zmi9gpa3svzqffyx13n4";
       };
   
       postUnpack = ''
  
positive.code: 
    # Need to test in a fixed-output derivation, otherwise the
    # network tests would fail if sandbox mode is enabled.
    dubUnittests = stdenv.mkDerivation rec {
      name = "dubUnittests-${version}";
      version = dubBuild.version;
  
      enableParallelBuilding = dubBuild.enableParallelBuilding;
      preferLocalBuild = true;
      inputString = dubBuild.outPath;
      outputHashAlgo = "sha256";
      outputHash = builtins.hashString "sha256" inputString;
  
      src = dubBuild.src;
      
      postUnpack = dubBuild.postUnpack;
      postPatch = dubBuild.postPatch;
  
      nativeBuildInputs = dubBuild.nativeBuildInputs;
      buildInputs = dubBuild.buildInputs;
  
      buildPhase = ''
        # Can't use dub from dubBuild directly because one unittest 
        # (issue895-local-configuration) needs to generate a config 
        # file under ../etc relative to the dub location.
        cp ${dubBuild}/bin/dub bin/
        export DUB=$NIX_BUILD_TOP/source/bin/dub
        export PATH=$PATH:$NIX_BUILD_TOP/source/bin/
        export DC=${dmd.out}/bin/dmd
        export HOME=$TMP
        ./test/run-unittest.sh
      '';
  
      installPhase = ''
          echo -n $inputString > $out
      '';
    };
  
  in
  
  
negative.code: 
    dubBuild = stdenv.mkDerivation rec {
      name = "dubBuild-${version}";
      version = "1.10.0";
  
      enableParallelBuilding = true;
  
  