anchor.diff:      "-DIGRAPH_USE_INTERNAL_LAPACK=OFF"
       "-DIGRAPH_USE_INTERNAL_ARPACK=OFF"
       "-DIGRAPH_USE_INTERNAL_GLPK=OFF"
  -    "-DIGRAPH_USE_INTERNAL_CXSPARSE=OFF"
       "-DIGRAPH_USE_INTERNAL_GMP=OFF"
       "-DIGRAPH_USE_INTERNAL_PLFIT=OFF"
       "-DIGRAPH_GLPK_SUPPORT=ON"
  
positive.code: , plfit
  , python3
  , sourceHighlight
  , suitesparse
  , xmlto
  }:
  
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "igraph";
    version = "0.10.2";
  
    src = fetchFromGitHub {
      owner = "igraph";
      repo = pname;
      rev = version;
      hash = "sha256-6zX9hyz/8H7r+wzpVwz8jDMfd3nqit3pT+wlP0C40Rg=";
    };
  
    postPatch = ''
      echo "${version}" > IGRAPH_VERSION
    '';
  
    outputs = [ "out" "dev" "doc" ];
  