anchor.diff:  
     nativeBuildInputs = [ pkgconfig ];
     buildInputs = [ flex bison zlib proj gdal libtiff libpng fftw sqlite cairo
  -  readline ffmpeg makeWrapper wxGTK30 netcdf geos postgresql mysql.connector-c blas ]
  +  readline ffmpeg makeWrapper wxGTK30 netcdf geos postgresql mysql.connector-c blas
  +  libLAS ]
       ++ (with python2Packages; [ python dateutil wxPython30 numpy ]);
   
     # On Darwin the installer tries to symlink the help files into a system
  
positive.code:     "--with-mysql-includes=${mysql.connector-c}/include/mysql"
      "--with-mysql-libs=${mysql.connector-c}/lib/mysql"
      "--with-blas"
    ];
  
    # Otherwise a very confusing "Can't load GDAL library" error
  
negative.code: { stdenv, fetchurl, flex, bison, pkgconfig, zlib, libtiff, libpng, fftw
  , cairo, readline, ffmpeg, makeWrapper, wxGTK30, netcdf, blas
  , proj, gdal, geos, sqlite, postgresql, mysql, python2Packages, libLAS
  }:
  
  stdenv.mkDerivation {
  