Enable build of fgpanel by default in cmake

CMakeLists.txt

@@ -56,6 +56,7 @@ option(ENABLE_JSBSIM "Set to ON to build FlightGear with JSBSim FDM" ON)
 option(ENABLE_FGADMIN "Set to ON to build FlightGear with FGADMIN" ON)
 option(EVENT_INPUT "Set to ON to build FlightGear with event-based Input support" OFF)
 option(ENABLE_LIBSVN "Set to ON to build FlightGear/terrasync with libsvnclient support" OFF)
+option(WITH_FGPANEL "Set to ON to build the fgpanel application" ON)
 
 set(MSVC_3RDPARTY_ROOT NOT_FOUND CACHE PATH "Location where the third-party dependencies are extracted")
 
@@ -65,6 +66,12 @@ else()
 	set(FG_NDEBUG 1)
 endif()
 
+if(WITH_FGPANEL)
+	message(STATUS "Will build fgpanel")
+else()
+	message(STATUS "Will NOT build fgpanel")
+endif()
+
 if(SP_FDMS)
 	set(ENABLE_SP_FDM 1)
 endif()

utils/fgpanel/CMakeLists.txt

@@ -14,6 +14,7 @@ add_executable(fgpanel main.cxx
 	panel_io.cxx)
 
 target_link_libraries(fgpanel 
+	-lrt
 	${PNG_LIBRARIES}
 	${GLUT_LIBRARIES}
 	${SIMGEAR_LIBRARIES}