if (USE_INTERNAL_BOOST_LIBRARY)
	set (Boost_PROGRAM_OPTIONS_LIBRARY boost_program_options_internal)
	set (Boost_SYSTEM_LIBRARY boost_system_internal)
	set (Boost_FILESYSTEM_LIBRARY boost_filesystem_internal)
else ()
	set (Boost_USE_STATIC_LIBS ${USE_STATIC_LIBRARIES})
	set (BOOST_ROOT "/usr/local")
	find_package (Boost 1.58 COMPONENTS program_options system filesystem regex thread)
	if (NOT Boost_FOUND)
		# Try to find manually.
		set (BOOST_HINTS "")
		if (USE_STATIC_LIBRARIES)
			find_library (Boost_PROGRAM_OPTIONS_LIBRARY libboost_program_options.a HINTS ${BOOST_HINTS})
			find_library (Boost_SYSTEM_LIBRARY libboost_system.a HINTS ${BOOST_HINTS})
			find_library (Boost_FILESYSTEM_LIBRARY libboost_filesystem.a HINTS ${BOOST_HINTS})
		else ()
			find_library (Boost_PROGRAM_OPTIONS_LIBRARY boost_program_options HINTS ${BOOST_HINTS})
			find_library (Boost_SYSTEM_LIBRARY boost_system HINTS ${BOOST_HINTS})
			find_library (Boost_FILESYSTEM_LIBRARY boost_filesystem HINTS ${BOOST_HINTS})
		endif ()
	endif ()
endif ()