message: Removed Eigen3 paths from initial_cache template
  The submodule is used by default, and EIGEN3_INCLUDE_DIR should only be set if a user has an explicit need for it.
diff: # Linux: Boost can usually be installed via a package manager (e.g. apt-get install boost-all-dev) and this variable can be left uncommented.
  #set(BOOST_ROOT "/home/user/boost/install" CACHE PATH "Boost search location" FORCE)
  -# Eigen3:
  -# -------
  -# Windows: Set to the path of the unzipped Eigen3 file.
  -set(EIGEN3_INCLUDE_DIR "D:/eigen-10219c95fe65" CACHE PATH "Directory of the Eigen3 headers" FORCE)
  -# Linux: Can be left empty when installed system-wide. (Note/Todo: Doesnt work with Eigen 3.0.5 from Ubuntu 12.04). Otherwise, set the path manually.
  -#set(EIGEN3_INCLUDE_DIR "/home/user/eigen-10219c95fe65" CACHE PATH "Directory of the Eigen3 headers" FORCE)
  +
  # Mechanism via ConfigLIB.cmake in 3rd party library directory
  # ==============================
  # OpenCV:
  