anchor.diff:      ''
         --with-store-dir=${storeDir} --localstatedir=${stateDir}
         --with-bzip2=${bzip2} --with-sqlite=${sqlite}
  +      --with-dbi=${perlPackages.DBI}/lib/perl5/site_perl
  +      --with-dbd-sqlite=${perlPackages.DBDSQLite}/lib/perl5/site_perl
         --disable-init-state
         --enable-gc
         CFLAGS=-O3 CXXFLAGS=-O3
  
positive.code:     doCheck = false;
    };
  
    doCheck = true;
  
    meta = {
  
negative.code: { stdenv, fetchurl, perl, curl, bzip2, sqlite, openssl ? null
  , pkgconfig, boehmgc, perlPackages
  , storeDir ? "/nix/store"
  , stateDir ? "/nix/var"
  }:
  
  stdenv.mkDerivation rec {
    name = "nix-1.0pre26784";
  
    src = fetchurl {
      url = "http://hydra.nixos.org/build/1041231/download/4/${name}.tar.bz2";
      sha256 = "33711d31b25b99f0ee06ad093332f71b2be5abdbb52d5eed77c42d7e24ad3765";
    };
  
    buildNativeInputs = [ perl pkgconfig ];
  