--- a/src/model.cpp Tue Feb 14 14:59:26 2017 +0200 +++ b/src/model.cpp Tue Feb 14 15:11:33 2017 +0200 @@ -23,6 +23,7 @@ #include "linetypes/conditionaledge.h" #include "linetypes/edgeline.h" #include "linetypes/empty.h" +#include "linetypes/triangle.h" Model::Model(DocumentManager* manager) : QObject {manager},