IF(QT_FOUND)
  ADD_SUBDIRECTORY(k-means)
  ADD_SUBDIRECTORY(llm-1D)
  ADD_SUBDIRECTORY(llm-2D)
  ADD_SUBDIRECTORY(polynomial-regression)
  ADD_SUBDIRECTORY(quad-tree)
  IF(PCL_FOUND)
    ADD_SUBDIRECTORY(octree)
  ENDIF()
ENDIF()