find_path(LZ4_INCLUDE_DIR lz4.h) find_library(LZ4_LIBRARY NAMES lz4) if (LZ4_INCLUDE_DIR AND LZ4_LIBRARY) set(LZ4_FOUND TRUE) message(STATUS "Found LZ4 library: ${LZ4_LIBRARY}") else () message(STATUS "No lz4 found. Using internal sources.") endif ()