anchor.diff:  
         createOctavePackagesPath $out ${octave}
   
  -      for path in ${stdenv.lib.concatStringsSep " " packages}; do
  +      for path in ${lib.concatStringsSep " " packages}; do
             if [ -e $path/*.tar.gz ]; then
                $out/bin/octave-cli --eval "pkg local_list $out/.octave_packages; \
                                            pkg prefix $out/${octave.octPkgsPath} $out/${octave.octPkgsPath}; \
  
positive.code:       # To point to the new local_list in $out
        addPkgLocalList $out ${octave}
  
        wrapOctavePrograms "${stdenv.lib.concatStringsSep " " packages}"
       '' + postBuild;
  
    inherit (octave) meta;
  
negative.code: { lib, stdenv, octave, buildEnv
  , makeWrapper, texinfo
  , octavePackages
  , wrapOctave
  