would fix: #618 #790 #795 (#871)

CMakeLists.txt

@@ -349,6 +349,13 @@ IF(WITH_QT)
     ENDIF(QT4_FOUND OR Qt5_FOUND)
 ENDIF(WITH_QT)
 
+IF(NOT VTK_FOUND)
+    # Newest PCL versions won't set -DDISABLE_VTK
+    IF(NOT "${PCL_DEFINITIONS}" MATCHES "-DDISABLE_VTK")
+        SET(PCL_DEFINITIONS "${PCL_DEFINITIONS};-DDISABLE_VTK")
+    ENDIF()
+ENDIF(NOT VTK_FOUND)
+
 IF(WITH_TORCH)
     FIND_PACKAGE(Torch QUIET)
     IF(TORCH_FOUND)