anchor.diff:  { lib
   , fetchurl
  -, fetchpatch
   , nixosTests
   , python3
   , ghostscript
  
positive.code: in
  py.pkgs.pythonPackages.buildPythonApplication rec {
    pname = "paperless-ngx";
    version = "1.6.0";
  
    src = fetchurl {
      url = "https://github.com/paperless-ngx/paperless-ngx/releases/download/ngx-${version}/${pname}-${version}.tar.xz";
      sha256 = "07mrxbwahkm00n9nvssd6d13p80w333g84cd38bzp0l34nzim5zl";
    };
  
    format = "other";
  
negative.code:     numpy
      ocrmypdf
      pathvalidate
      pdf2image
      pdfminer-six
      pikepdf
      pillow
  