anchor.diff:      "--with-mysql-libs=${libmysqlclient}/lib/mysql"
       "--with-blas"
       "--with-liblas=${libLAS}/bin/liblas-config"
  +    "--with-zstd"
  +    "--with-fftw"
  +    "--with-pthread"
     ];
   
     # Otherwise a very confusing "Can't load GDAL library" error
  
positive.code: { lib, stdenv, fetchFromGitHub, flex, bison, pkg-config, zlib, libtiff, libpng, fftw
  , cairo, readline, ffmpeg, makeWrapper, wxGTK30, netcdf, blas
  , proj, gdal, geos, sqlite, postgresql, libmysqlclient, python3Packages, libLAS, proj-datumgrid
  , zstd
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:   nativeBuildInputs = [ pkg-config ];
    buildInputs = [ flex bison zlib proj gdal libtiff libpng fftw sqlite cairo
    readline ffmpeg makeWrapper wxGTK30 netcdf geos postgresql libmysqlclient blas
    libLAS proj-datumgrid zstd pdal ]
      ++ (with python3Packages; [ python python-dateutil wxPython_4_1 numpy ]);
  
    # On Darwin the installer tries to symlink the help files into a system
  