in Cmake
OPTION(OpenMVG_USE_LOG "Enable logger" ON)
# a variable to set the type of logger to use
set(OpenMVG_LOGGER "LOG_COUT" CACHE STRING "The logger to use for openMVG"))
set(LOGGERS_Values "LOG_COUT;LOG_BOOST;LOG_GLOG" CACHE INTERNAL "List of possible values for the OpenMVG_LOGGER cache variable”)
set_property(CACHE OpenMVG_LOGGER PROPERTY STRINGS ${LOGGERS_Values})
...