sudo apt_get install libmodbus

find_path(MODBUS_INCLUDE_DIR NAMES modbus.h modbus/modbus.h REQUIRED)
message(STATUS "MODBUS_INCLUDE_DIR: ${MODBUS_INCLUDE_DIR}")

find_library(MODBUS_LIBRARY NAMES modbus REQUIRED)
message(STATUS "MODBUS_LIBRARY: ${MODBUS_LIBRARY}")

target_link_libraries(${PROJECT_NAME} PRIVATE
Threads::Threads logging Boost::filesystem ${IOKit_LIB} ${CoreFundation_LIB} ${MODBUS_LIBRARY})

include <mddbus/modbus.h>