diff -rupN CloudCompare-2.9.1/plugins/qPCL/PclUtils/filters/MLSSmoothingUpsampling.cpp CloudCompare-2.9.1-new/plugins/qPCL/PclUtils/filters/MLSSmoothingUpsampling.cpp
--- CloudCompare-2.9.1/plugins/qPCL/PclUtils/filters/MLSSmoothingUpsampling.cpp	2017-11-03 12:30:42.000000000 +0100
+++ CloudCompare-2.9.1-new/plugins/qPCL/PclUtils/filters/MLSSmoothingUpsampling.cpp	2021-05-08 14:59:43.450040253 +0200
@@ -25,6 +25,7 @@
 
 //PCL
 #include <pcl/surface/mls.h>
+#include <pcl/search/kdtree.h>
 
 //qCC_plugins
 #include <ccMainAppInterface.h>
diff -rupN CloudCompare-2.9.1/plugins/qPCL/PclUtils/utils/my_point_types.h CloudCompare-2.9.1-new/plugins/qPCL/PclUtils/utils/my_point_types.h
--- CloudCompare-2.9.1/plugins/qPCL/PclUtils/utils/my_point_types.h	2017-11-03 12:30:42.000000000 +0100
+++ CloudCompare-2.9.1-new/plugins/qPCL/PclUtils/utils/my_point_types.h	2021-05-08 14:58:57.696039230 +0200
@@ -19,7 +19,7 @@
 #define Q_PCL_PLUGIN_MY_POINT_TYPES_H
 
 //PCL
-#include <pcl/ros/register_point_struct.h>
+#include <pcl/register_point_struct.h>
 #include <pcl/point_types.h>
 
 //! PCL custom point type used for reading RGB data