anchor.diff:  { 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
  +, zstd, pdal
   }:
   
   stdenv.mkDerivation rec {
  
positive.code:     "--with-mysql-libs=${libmysqlclient}/lib/mysql"
      "--with-blas"
      "--with-liblas=${libLAS}/bin/liblas-config"
    ];
  
    # Otherwise a very confusing "Can't load GDAL library" error
  
negative.code:     "--with-readline"
      "--with-wxwidgets"
      "--with-netcdf"
      "--with-pdal"
      "--with-geos"
      "--with-postgres"
      "--with-postgres-libs=${postgresql.lib}/lib/"
  