if (NOT _MAC_DEPENDENCY_PATHS)
  set(_MAC_DEPENDENCY_PATHS)
  # As of CMake 2.8.3, Fink and MacPorts search paths are appended to the
  # default search prefix paths, but the nicer thing would be if they are
  # prepended to the default, so that is fixed here.
  if (APPLE)
    list(INSERT CMAKE_SYSTEM_PREFIX_PATH 0 /opt/local) # MacPorts
    list(INSERT CMAKE_SYSTEM_PREFIX_PATH 0 /sw) # Fink
  endif ()
endif ()
