option(SIMGEAR_SHARED "Set to ON when SimGear was built as a shared library" OFF)
option(LOGGING "Set to ON to build FlightGear with logging support (default)" ON)
option(JSBSIM_TERRAIN "Set to ON to build FlightGear with JSBSim terrain handling code" ON)
-option(SP_FDMS "Set to ON to build FlightGear with special-purpose FDMs" OFF)
-option(ENABLE_UIUC_MODEL "Set to ON to build FlightGear with UIUCModel FDM" OFF)
-option(ENABLE_LARCSIM "Set to ON to build FlightGear with LaRCsim FDM" OFF)
+option(SP_FDMS "Set to ON to build FlightGear with special-purpose FDMs" ON)
+option(ENABLE_UIUC_MODEL "Set to ON to build FlightGear with UIUCModel FDM" ON)
+option(ENABLE_LARCSIM "Set to ON to build FlightGear with LaRCsim FDM" ON)
option(ENABLE_YASIM "Set to ON to build FlightGear with YASIM FDM (default)" ON)
option(ENABLE_JSBSIM "Set to ON to build FlightGear with JSBSim FDM (default)" ON)
option(EVENT_INPUT "Set to ON to build FlightGear with event-based Input support" ${EVENT_INPUT_DEFAULT})