anchor.diff: -{ stdenv, fetchurl, flex, bison, pkgconfig, zlib, libtiff, libpng, fftw
  +{ stdenv, fetchFromGitHub, flex, bison, pkgconfig, zlib, libtiff, libpng, fftw
   , cairo, readline, ffmpeg, makeWrapper, wxGTK30, netcdf, blas
  -, proj, gdal, geos, sqlite, postgresql, mysql, python2Packages, libLAS
  +, proj, gdal, geos, sqlite, postgresql, mysql, python2Packages, libLAS, proj-datumgrid
   }:
   
  -stdenv.mkDerivation {
  -  name = "grass-7.2.2";
  -  src = fetchurl {
  -    url = https://grass.osgeo.org/grass72/source/grass-7.2.2.tar.gz;
  -    sha256 = "0yzljbrxlqp4wbw08n1dvmm4vmwkg8glf1ff4xyh589r5ryb7gxv";
  +stdenv.mkDerivation rec {
  +  name = "grass";
  +  version = "7.6.1";
  +
  +  src = with stdenv.lib; fetchFromGitHub {
  +    owner = "OSGeo";
  +    repo = "grass";
  +    rev = "${name}_${replaceStrings ["."] ["_"] version}";
  +    sha256 = "1amjk9rz7vw5ha7nyl5j2bfwj5if9w62nlwx5qbp1x7spldimlll";
     };
   
     nativeBuildInputs = [ pkgconfig ];
  -  buildInputs = [ flex bison zlib proj gdal libtiff libpng fftw sqlite cairo
  +  buildInputs = [ flex bison zlib proj gdal libtiff libpng fftw sqlite cairo proj
     readline ffmpeg makeWrapper wxGTK30 netcdf geos postgresql mysql.connector-c blas
  -  libLAS ]
  +  libLAS proj-datumgrid ]
       ++ (with python2Packages; [ python dateutil wxPython30 numpy ]);
   
     # On Darwin the installer tries to symlink the help files into a system
  
positive.code: 
    configureFlags = [
      "--with-proj-share=${proj}/share/proj"
      "--without-opengl"
      "--with-readline"
      "--with-wxwidgets"
  
negative.code:       scripts/d.what.vect/d.what.vect.py \
        scripts/g.extension/g.extension.py \
        scripts/g.extension.all/g.extension.all.py \
        scripts/r.drain/r.drain.py \
        scripts/r.pack/r.pack.py \
        scripts/r.tileset/r.tileset.py \
        scripts/r.unpack/r.unpack.py \
        scripts/v.clip/v.clip.py \
        scripts/v.rast.stats/v.rast.stats.py \
        scripts/v.to.lines/v.to.lines.py \
        scripts/v.what.strds/v.what.strds.py \
  