message: GudhUI CMakeLists.txt modifications. It is main CMakeLists.txt to find CGAL.
  Was not compiling with CGAL 4.3 for instance.
diff: cmake_minimum_required(VERSION 2.8)
  project(GudhUI)
  -find_package(CGAL COMPONENTS Qt5)
  find_package(Qt5 COMPONENTS Widgets Xml OpenGL)
  find_package(QGLViewer)
  find_package(OpenGL)
  -
  if (NOT CGAL_FOUND)
  message(ERROR " GudhUI requires CGAL and will not be compiled.")
  endif()
  