anchor.diff:  in
   
   buildPythonPackage rec {
  -  version = "3.5.2";
  +  version = "3.5.3";
     pname = "matplotlib";
     format = "setuptools";
   
  
positive.code: 
    src = fetchPypi {
      inherit pname version;
      sha256 = "18h78s5ld1i6mz00w258hy29909nfr3ddq6ry9kq18agw468bks8";
    };
  
    XDG_RUNTIME_DIR = "/tmp";
  
negative.code:       echo "[libs]
        system_freetype=true
        system_qhull=true" > mplsetup.cfg
  
        substituteInPlace setup.py \
          --replace "setuptools_scm>=4,<7" "setuptools_scm>=4"
      '';
  
    # Matplotlib needs to be built against a specific version of freetype in
  