{stdenv, fetchurl}:

stdenv.mkDerivation {
  name = "pcre-4.5";
  src = fetchurl {
    url = ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-4.5.tar.bz2;
    md5 = "c51bd34197008b128046f0799d2242e4";
  };
}