anchor.diff:    buildInputs = [ openssl proj geos xlibsWrapper sqlite gsl qwt exiv2
       fcgi libspatialindex libspatialite postgresql txt2tags libzip hdf5 netcdf
       qtbase qtwebkit qtsensors qca-qt5 qtkeychain qscintilla qtserialport qtxmlpatterns] ++
  -    (stdenv.lib.optional withGrass grass) ++ pythonBuildInputs;
  +    (lib.optional withGrass grass) ++ pythonBuildInputs;
   
     nativeBuildInputs = [ cmake flex bison ninja ];
   
  
positive.code: { stdenv, lib, fetchFromGitHub, cmake, ninja, flex, bison, proj, geos, xlibsWrapper, sqlite, gsl
  , qwt, fcgi, python3Packages, libspatialindex, libspatialite, postgresql
  , txt2tags, openssl, libzip, hdf5, netcdf, exiv2
  , qtbase, qtwebkit, qtsensors, qca-qt5, qtkeychain, qscintilla, qtserialport, qtxmlpatterns
  
negative.code:   pythonBuildInputs = with python3Packages;
      [ qscintilla-qt5 gdal jinja2 numpy psycopg2
        chardet dateutil pyyaml pytz requests urllib3 pygments pyqt5 sip owslib six ];
  in mkDerivation rec {
    version = "3.8.3";
    pname = "qgis";
    name = "${pname}-unwrapped-${version}";
  
  