default_shell.nix

with import <nixpkgs> {};

let
  python = python37;
in
pkgs.mkShell {
  name = "pip-env";
  buildInputs = with pkgs; [
    gmp5
    libffi
  ];
  src = null;
  shellHook = ''
    # Allow the use of wheels.
    SOURCE_DATE_EPOCH=$(date +%s)


   export PYTHONPATH=`pwd`/$VENV/${python.sitePackages}/:$PYTHONPATH
   export LD_LIBRARY_PATH=${lib.makeLibraryPath [libffi gmp5 stdenv.cc.cc]} 
  '';
}