anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "simgrid";
  -  version = "3.30";
  +  version = "3.31";
   
     src = fetchFromGitLab {
       domain = "framagit.org";
       owner = pname;
       repo = pname;
       rev = "v${version}";
  -    sha256 = "1dg8ywqif20g0fs8dnd6364n080nvwx7f444zcfwqwz6iax61qv1";
  +    sha256 = "sha256-K6YkkCMxc2lqxHIwyuLiwcp3m49sqbEtOlwZh4L1YJg=";
     };
   
     propagatedBuildInputs = [ boost ];
  
positive.code: , buildJavaBindings ? false, openjdk
  , buildPythonBindings ? true, python3Packages
  , modelCheckingSupport ? false, libunwind, libevent, elfutils # Inside elfutils: libelf and libdw
  , minimalBindings ? false
  , debug ? false
  , optimize ? (!debug)
  
negative.code:     ++ optionals buildJavaBindings [ openjdk ]
      ++ optionals buildPythonBindings [ python3Packages.pybind11 ]
      ++ optionals buildDocumentation [ fig2dev ghostscript doxygen ]
      ++ optionals bmfSupport [ eigen ]
      ++ optionals modelCheckingSupport [ libunwind libevent elfutils ];
  
    outputs = [ "out" ]
  