diff -up ./gazebo/gui/model/ModelTreeWidget.cc.boost173 ./gazebo/gui/model/ModelTreeWidget.cc
--- ./gazebo/gui/model/ModelTreeWidget.cc.boost173	2019-03-28 20:58:32.000000000 -0400
+++ ./gazebo/gui/model/ModelTreeWidget.cc	2020-08-08 17:36:39.397952859 -0400
@@ -24,6 +24,7 @@
 
 using namespace gazebo;
 using namespace gui;
+using namespace boost::placeholders;
 
 /////////////////////////////////////////////////
 ModelTreeWidget::ModelTreeWidget(QWidget *_parent)
diff -up ./gazebo/gui/model/SchematicViewWidget.cc.boost173 ./gazebo/gui/model/SchematicViewWidget.cc
--- ./gazebo/gui/model/SchematicViewWidget.cc.boost173	2019-03-28 20:58:32.000000000 -0400
+++ ./gazebo/gui/model/SchematicViewWidget.cc	2020-08-08 17:36:39.397952859 -0400
@@ -32,6 +32,7 @@
 
 using namespace gazebo;
 using namespace gui;
+using namespace boost::placeholders;
 
 /////////////////////////////////////////////////
 SchematicViewWidget::SchematicViewWidget(QWidget *_parent)
diff -up ./test/integration/model_database.cc.boost173 ./test/integration/model_database.cc
--- ./test/integration/model_database.cc.boost173	2020-08-08 19:45:51.176525049 -0400
+++ ./test/integration/model_database.cc	2020-08-08 19:46:29.983287693 -0400
@@ -20,6 +20,7 @@
 #include "test_config.h"
 
 using namespace gazebo;
+using namespace boost::placeholders;
 
 int g_onModels = 0;
 int g_onModels1 = 0;
diff -up ./test/plugins/ForceTorqueModelRemovalTestPlugin.cc.boost173 ./test/plugins/ForceTorqueModelRemovalTestPlugin.cc
--- ./test/plugins/ForceTorqueModelRemovalTestPlugin.cc.boost173	2020-08-08 19:47:14.683014303 -0400
+++ ./test/plugins/ForceTorqueModelRemovalTestPlugin.cc	2020-08-08 19:47:22.041969295 -0400
@@ -21,6 +21,7 @@
 
 
 using namespace gazebo;
+using namespace boost::placeholders;
 
 GZ_REGISTER_SENSOR_PLUGIN(ForceTorqueModelRemovalTestPlugin)