{ stdenv, fetchurl
, gmp, readline, libX11, tex, perl
, withThread ? true, libpthreadstubs
}:

assert withThread -> libpthreadstubs != null;

stdenv.mkDerivation rec {

  name = "pari-${version}";
  version = "2.9.5";

  src = fetchurl {
    url = "http://pari.math.u-bordeaux.fr/pub/pari/unix/${name}.tar.gz";
    sha256 = "05z6y5iwdzcdggbrkic9cy9vy9wmk5qxc21cb4lqnbqxnhjihibb";
  };

  buildInputs = [
    gmp
    readline
    libX11
    tex
    perl
  ] ++ stdenv.lib.optionals withThread [
    libpthreadstubs
  ];

  configureScript = "./Configure";
  configureFlags = [
    "--with-gmp=${gmp.dev}"
    "--with-readline=${readline.dev}"
  ] ++ stdenv.lib.optional stdenv.isDarwin "--host=x86_64-darwin"
  ++ stdenv.lib.optional withThread "--mt=pthread";

  preConfigure = ''
    export LD=$CC
  '';

  postConfigure = stdenv.lib.optionalString stdenv.isDarwin ''
    echo 'echo x86_64-darwin' > config/arch-osname
  '';

  makeFlags = [ "all" ];

  meta = with stdenv.lib; {
    description = "Computer algebra system for high-performance number theory computations";
    longDescription = ''
       PARI/GP is a widely used computer algebra system designed for fast
       computations in number theory (factorizations, algebraic number theory,
       elliptic curves...), but also contains a large number of other useful
       functions to compute with mathematical entities such as matrices,
       polynomials, power series, algebraic numbers etc., and a lot of
       transcendental functions. PARI is also available as a C library to allow
       for faster computations.

       Originally developed by Henri Cohen and his co-workers (Université
       Bordeaux I, France), PARI is now under the GPL and maintained by Karim
       Belabas with the help of many volunteer contributors.

       - PARI is a C library, allowing fast computations.
       - gp is an easy-to-use interactive shell giving access to the
          PARI functions.
       - GP is the name of gp's scripting language.
       - gp2c, the GP-to-C compiler, combines the best of both worlds
          by compiling GP scripts to the C language and transparently loading
          the resulting functions into gp. (gp2c-compiled scripts will typically
          run 3 or 4 times faster.) gp2c currently only understands a subset
           of the GP language.
    '';
    homepage    = "http://pari.math.u-bordeaux.fr/";
    downloadPage = "http://pari.math.u-bordeaux.fr/download.html";
    license     = licenses.gpl2Plus;
    maintainers = with maintainers; [ ertes raskin AndersonTorres ];
    platforms   = platforms.linux ++ platforms.darwin;
    updateWalker = true;
  };
}