let
  mach-nix = import (builtins.fetchGit {
    url = "https://github.com/DavHau/mach-nix";
    ref = "refs/tags/3.3.0";
  }) {
    python = "python39";
  };
  fcSpline = (mach-nix.buildPythonPackage
    {src="https://github.com/cimatosa/fcSpline/tarball/master";
     pname="fcSpline";
     version="0.1";
     requirements=''
           numpy
           cython
           setuptools
           scipy
       '';
    });
in
mach-nix.mkPythonShell {
  packagesExtra = [
    fcSpline
    (mach-nix.buildPythonPackage
      {src="https://github.com/cimatosa/stocproc/tarball/master";
       pname="stocproc";
       packagesExtra = [fcSpline];
       # buildInputs.add = [fcSpline];
       version = "1.0.0";
       requirements = ''
           numpy
           cython
           setuptools
           mpmath
           scipy
       '';
      })
  ];
  _.stocproc.buildInputs.add = [fcSpline];
  _.stocproc.patches = [./stocproc.patch];
  requirements = ''
    numpy
    jupyter-spaces
    ptpython
    jedi
    black
    flake8
    matplotlib
    scipy
    jupyter
    h5py
    sqlitedict
  '';
  ignoreCollisions = true;
}