option (USE_INTERNAL_LZ4_LIBRARY "Set to FALSE to use system lz4 library instead of bundled" ${NOT_UNBUNDLED})

if (NOT USE_INTERNAL_LZ4_LIBRARY)
	find_library (LZ4_LIBRARY lz4)
	find_path (LZ4_INCLUDE_DIR NAMES lz4.h PATHS ${LZ4_INCLUDE_PATHS})
endif ()

if (LZ4_LIBRARY AND LZ4_INCLUDE_DIR)
	include_directories (${LZ4_INCLUDE_DIR})
else ()
	set (USE_INTERNAL_LZ4_LIBRARY 1)
	set (LZ4_INCLUDE_DIR "${ClickHouse_SOURCE_DIR}/contrib/liblz4/include/lz4")
	include_directories (BEFORE ${LZ4_INCLUDE_DIR})
	set (LZ4_LIBRARY lz4)
endif ()

message (STATUS "Using lz4: ${LZ4_INCLUDE_DIR} : ${LZ4_LIBRARY}")