NDOF related edits

- fix for building without NDOF on X11
- quiet some warnings

CMakeLists.txt

@@ -179,7 +179,7 @@ option(WITH_LZO           "Enable fast LZO compression (used for pointcache)" ON
 option(WITH_LZMA          "Enable best LZMA compression, (used for pointcache)" ON)
 
 # Misc
-option(WITH_NDOF "Enable NDOF input devices (SpaceNavigator and friends)" ON)
+option(WITH_INPUT_NDOF "Enable NDOF input devices (SpaceNavigator and friends)" ON)
 option(WITH_RAYOPTIMIZATION	"Enable use of SIMD (SSE) optimizations for the raytracer" ON) 
 if(UNIX AND NOT APPLE)
 	option(WITH_INSTALL_PORTABLE "Install redistributeable runtime, otherwise install into CMAKE_INSTALL_PREFIX" ON)
@@ -453,7 +453,7 @@ if(UNIX AND NOT APPLE)
 		endif()
 	endif()
 
-	if (WITH_NDOF)
+	if (WITH_INPUT_NDOF)
 		if(CMAKE_SYSTEM_NAME MATCHES "Linux")
 			set(NDOF /usr)
 			set(NDOF_INC ${NDOF}/include)
@@ -1039,7 +1039,7 @@ elseif(APPLE)
 		set(TIFF_LIBPATH ${TIFF}/lib)
 	endif()
 
-	if (WITH_NDOF)
+	if (WITH_INPUT_NDOF)
 		# linker needs "-weak_framework 3DconnexionClient"
 	endif()