{ stdenv, fetchurl, nano }:

stdenv.mkDerivation {
  name = "cvs-1.12.13";

  src = fetchurl {
    url = http://ftp.gnu.org/non-gnu/cvs/source/feature/1.12.13/cvs-1.12.13.tar.bz2;
    sha256 = "0pjir8cwn0087mxszzbsi1gyfc6373vif96cw4q3m1x6p49kd1bq";
  };

  patches = [ ./getcwd-chroot.patch ];

  preConfigure =
    # Apply the Debian patches.
    '' for p in "debian/patches/"*
       do
         echo "applying \`$p'..."
         patch --verbose -p1 < "$p"
       done
    '';

  buildInputs = [ nano ];
}
