first attempt at CMake fix (untested)

CMakeLists.txt

@@ -155,6 +155,7 @@ 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_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)
@@ -418,6 +419,15 @@ if(UNIX AND NOT APPLE)
 		unset(JEMALLOC)
 	endif()
 
+	if (WITH_NDOF)
+		if(CMAKE_SYSTEM_NAME MATCHES "Linux")
+			set(NDOF /usr)
+			set(NDOF_INC ${NDOF}/include)
+			set(NDOF_LIB spnav)
+			set(NDOF_LIBPATH ${FFTW3}/lib)
+		endif()
+	endif()
+
 	# OpenSuse needs lutil, ArchLinux not, for now keep, can avoid by using --as-needed
 	set(LLIBS "-lutil -lc -lm -lpthread -lstdc++")
 
@@ -960,6 +970,11 @@ elseif(APPLE)
 		set(TIFF_LIBPATH ${TIFF}/lib)
 	endif()
 
+	if (WITH_NDOF)
+		# GHOST_NDOFManagerCocoa.mm needs "-fpascal-strings"
+		# linker needs "-weak_framework 3DconnexionClient"
+	endif()
+
 	set(EXETYPE MACOSX_BUNDLE)
 
 	set(CMAKE_C_FLAGS_DEBUG "-fno-strict-aliasing -g")