message: Fix caffe rpath
  The logic for setting the library RPATH checks whether or not
  ${CMAKE_INSTALL_PREFIX}/lib is a system directory, and if not
  adds it to the library RPATH. However, caffe does not install
  to ${CMAKE_INSTALL_PREFIX}/lib, it installs to
  ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR} (from
  GNUInstallDirs). CMAKE_INSTALL_LIBDIR may be something like
  "lib/x86_64-linux-gnu"
diff: @@ -32,9 +32,10 @@ endif()
  set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE CACHE BOOLEAN "Use link paths for shared library rpath")
  set(CMAKE_MACOSX_RPATH TRUE)
  -list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES ${CMAKE_INSTALL_PREFIX}/lib __is_systtem_dir)
  +list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
  + ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR} __is_systtem_dir)
  if(${__is_systtem_dir} STREQUAL -1)
  - set(CMAKE_INSTALL_RPATH ${CMAKE_INSTALL_PREFIX}/lib)
  + set(CMAKE_INSTALL_RPATH ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
  endif()
  # ---[ Funny target
  