fix build problem with swig
fix build problem with swig

d-tk/dtk,rdebroiz/dtk,rdebroiz/dtk,NicolasSchnitzler/dtk,d-tk/dtk,rdebroiz/dtk,NicolasSchnitzler/dtk,NicolasSchnitzler/dtk,NicolasSchnitzler/dtk,d-tk/dtk,d-tk/dtk,rdebroiz/dtk,d-tk/dtk,d-tk/dtk