anchor.diff:      configureFlags =
         ''
           --with-store-dir=${storeDir} --localstatedir=${stateDir}
  -        --with-dbi=${perlPackages.DBI}/lib/perl5/site_perl
  -        --with-dbd-sqlite=${perlPackages.DBDSQLite}/lib/perl5/site_perl
  +        --with-dbi=${perlPackages.DBI}/${perl.libPrefix}
  +        --with-dbd-sqlite=${perlPackages.DBDSQLite}/${perl.libPrefix}
  +        --with-www-curl=${perlPackages.WWWCurl}/${perl.libPrefix}
           --disable-init-state
           --enable-gc
           CFLAGS=-O3 CXXFLAGS=-O3
         '' + stdenv.lib.optionalString (
             stdenv.cross ? nix && stdenv.cross.nix ? system
         ) ''--with-system=${stdenv.cross.nix.system}'';
  -      
  +
       doInstallCheck = false;
     };
   
  
positive.code:   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
        --enable-gc
        CFLAGS=-O3 CXXFLAGS=-O3
  
negative.code: }:
  
  stdenv.mkDerivation rec {
    name = "nix-1.2pre2910_b674665";
  
    src = fetchurl {
      url = "http://hydra.nixos.org/build/3031673/download/4/${name}.tar.bz2";
      sha256 = "fa9849f69a262547856190fe1a24e6d6bd15344fe2ef0a0e54c35ab172074a22";
    };
  
    buildNativeInputs = [ perl pkgconfig ];
  