anchor.diff:      gexiv2
       luajit
       openexr
  +    suitesparse
     ] ++ stdenv.lib.optional stdenv.isDarwin OpenCL;
   
     # for gegl-4.0.pc
  
positive.code: , luajit
  , openexr
  , OpenCL
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:     "-Dlibav=disabled"
      "-Dlibv4l=disabled"
      "-Dlibv4l2=disabled"
      # Disabled due to multiple vulnerabilities, see
      # https://github.com/NixOS/nixpkgs/pull/73586
      "-Djasper=disabled"
  