/builddir/build/BUILD/FreeCAD-0.18.4/src/Gui/DAGView/DAGView.cpp: In constructor 'Gui::DAG::View::View(QWidget*)':
/builddir/build/BUILD/FreeCAD-0.18.4/src/Gui/DAGView/DAGView.cpp:55:100: error: '_1' was not declared in this scope
   55 |   Application::Instance->signalActiveDocument.connect(boost::bind(&View::slotActiveDocument, this, _1));
      |                                                                                                    ^~

Full log:

Scratch build:

Any ideas?

Thanks,

Richard