foo.nix

{ pkgs ? import <nixpkgs> {} }:
with pkgs;

let
  inherit stdenv fetchurl perl;
  version = "2.1.1";

in

{
sundials = stdenv.mkDerivation rec {
  pname = "sundials";
  version = "3.2.1";

  src = fetchurl {
    url = "https://computation.llnl.gov/projects/${pname}/download/${pname}-${version}.tar.gz";
    sha256 = "0238r1qnwqz13wcjzfsbcfi8rfnlxcjjmxq2vpf2qf5jgablvna7";
  };

buildInputs = [ cmake ] ++
              [ python ] ++
                # stdenv.lib.optionals (lapackSupport) [ openblas liblapack gfortran ];
              [ openblas liblapack gfortran ];
  nativeBuildInputs = [ cmake ];

  cmakeFlags = [
    "-DEXAMPLES_INSTALL_PATH=${placeholder "out"}/share/examples"
    "-DEXAMPLES_INSTALL=ON"
    "-DEXAMPLES_ENABLE_C=ON"
  ] ++ [
    "-DSUNDIALS_INDEX_TYPE=int32_t"
    "-DLAPACK_ENABLE=ON"
    "-DLAPACK_LIBRARIES=${openblas}/lib/libblas${stdenv.hostPlatform.extensions.sharedLibrary};${openblas}/lib/liblapack.dylib"
  ];

  postInstall = ''
                  mkdir $out/easytofind
                  echo $(ls) > $out/easytofind/foo.txt
                  cp -r . $out/easytofind
                  cd $out/easytofind/LapackTest
                  echo $(pwd) > $out/easytofind/bar.txt
                  make
                  ./ltest > $out/easytofind/ltest.out
                '';

  meta = with stdenv.lib; {
    description = "Suite of nonlinear differential/algebraic equation solvers";
    homepage    = https://computation.llnl.gov/projects/sundials;
    platforms   = platforms.all;
    maintainers = [ maintainers.idontgetoutmuch ];
    license     = licenses.bsd3;
  };

};
}