-libInput_Event_SOURCES = FGEventInput.cxx FGEventInput.hxx FGLinuxEventInput.cxx FGLinuxEventInput.hxx
-libInput_Event_INCLUDES = -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include
+EXTRA_libInput_a_SOURCES = FGLinuxEventInput.cxx FGLinuxEventInput.hxx \
+ FGMacOSXEventInput.cxx FGMacOSXEventInput.hxx
+libInput_Event_SOURCES = FGEventInput.cxx FGEventInput.hxx
+libInput_Event_INCLUDES = $(eventinput_INCLUDES)
+libInput_a_LIBADD = $(eventinput_EXTRA_OBJS)
+libInput_a_DEPENDENCIES = $(eventinput_EXTRA_OBJS)