ldapvi: fetch rev, fix version number

stdenv.mkDerivation {

  pname = "ldapvi";

  version = "0lz1sb5r0y9ypy8d7hm0l2wfa8l69f8ll0i5c78c0apz40nyjqkg";

  version = "unstable-2012-04-28";

  # use latest git, it includes some important patches since 2007 release

  src = fetchgit {

    url = "http://www.lichteblau.com/git/ldapvi.git";

    rev = "f1d42bad66cc4623d1ff21fbd5dddbf5009d3e40";

    sha256 = "3ef3103030ecb04d7fe80180e3fd490377cf81fb2af96782323fddabc3225030";

  };