anchor.diff:    ];
   
     enableParallelBuilding = false;
  +
  +  meta = with lib; {
  +    description = "Python module for manipulation and statistical analysis of graphs";
  +    homepage    = "https://graph-tool.skewed.de/";
  +    license     = licenses.gpl3;
  +    maintainers = [ maintainers.joelmo ];
  +  };
   }
  
positive.code: { stdenv, fetchurl, python, cairomm, sparsehash, pycairo, autoreconfHook
  , pkg-config, boost, expat, scipy, cgal, gmp, mpfr
  , gobject-introspection, pygobject3, gtk3, matplotlib, ncurses
  , buildPythonPackage
  
negative.code: buildPythonPackage rec {
    pname = "graph-tool";
    format = "other";
    version = "2.30";
  
    src = fetchurl {
      url = "https://downloads.skewed.de/graph-tool/graph-tool-${version}.tar.bz2";
      sha256 = "1gy8xhwfms0psdji7vzqjbzj3l0k743aw20db27zxyq89cvz6g42";
    };
  
    configureFlags = [
  