anchor.diff:  
     enableParallelBuilding = true;
   
  -  doCheck = true;
  +  installCheckPhase = "make installcheck";
   
  -  # Hack to get the check to succeed on Darwin.
  -  phases = stdenv.lib.optionalString stdenv.isDarwin
  -    "$prePhases unpackPhase patchPhase $preConfigurePhases configurePhase $preBuildPhases buildPhase $preInstallPhases installPhase checkPhase fixupPhase $preDistPhases distPhase $postPhases";
  +  postPhases = [ "installCheckPhase" ];
   
     meta = {
       description = "The Nix Deployment System";
  
positive.code:     configureFlags =
        ''
          --with-store-dir=${storeDir} --localstatedir=${stateDir}
          --with-bzip2=${bzip2.hostDrv} --with-sqlite=${sqlite.hostDrv}
          --enable-gc
          --with-dbi=${perlPackages.DBI}/lib/perl5/site_perl
          --with-dbd-sqlite=${perlPackages.DBDSQLite}/lib/perl5/site_perl
          --disable-init-state
          CFLAGS=-O3 CXXFLAGS=-O3
        '' + stdenv.lib.optionalString (
            stdenv.cross ? nix && stdenv.cross.nix ? system
  
negative.code: }:
  
  stdenv.mkDerivation rec {
    name = "nix-1.0pre2632_b8fb0ce";
  
    src = fetchurl {
      url = "http://hydra.nixos.org/build/2337744/download/4/${name}.tar.bz2";
      sha256 = "5f965a54ac4ef949b1531d21c3bc1c920552ea3103a39669a3b8a4f3187bd6da";
    };
  
    buildNativeInputs = [ perl pkgconfig ];
    buildInputs = [ curl openssl boehmgc bzip2 sqlite ];
  
    configureFlags =
      ''
        --with-store-dir=${storeDir} --localstatedir=${stateDir}
        --with-dbi=${perlPackages.DBI}/lib/perl5/site_perl
        --with-dbd-sqlite=${perlPackages.DBDSQLite}/lib/perl5/site_perl
        --disable-init-state
  