rPackages.stringi: remove unneeded override

      postPatch = "patchShebangs configure";

    });

    stringi = old.stringi.overrideAttrs (attrs: {

      postInstall = let

        icuName = "icudt52l";

        icuSrc = pkgs.fetchzip {

          url = "http://static.rexamine.com/packages/${icuName}.zip";

          sha256 = "0hvazpizziq5ibc9017i1bb45yryfl26wzfsv05vk9mc1575r6xj";

          stripRoot = false;

        };

        in ''

          ${attrs.postInstall or ""}

          cp ${icuSrc}/${icuName}.dat $out/library/stringi/libs

        '';

    });

    xml2 = old.xml2.overrideAttrs (attrs: {

      preConfigure = ''

        export LIBXML_INCDIR=${pkgs.libxml2.dev}/include/libxml2