In RTEMS4.12, some names have changed and/or become deprecated...

OAR/src/system.h

 // Comment this to skip memory checks at startup
 #define MEMCHECK
 
+#include <rtems/score/cpuopts.h>
 #include <rtems/score/types.h>
 #include <rtems/rtems/types.h>
 #include <rtems/rtems/tasks.h>
@@ -18,12 +19,30 @@ void memcheck(void);
 #define CONFIGURE_TICKS_PER_TIMESLICE     100
 #define CONFIGURE_RTEMS_INIT_TASKS_TABLE
 #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
+
+// In RTEMS master (i.e. the future 4.12) some names have changed...
+#if __RTEMS_MAJOR__  == 4 && \
+        ( __RTEMS_MINOR__ > 11 || \
+            ( __RTEMS_MINOR__ == 11 && __RTEMS_REVISION__ >= 99))
+
+#ifdef BSP_leon2
+#define CONFIGURE_MAXIMUM_PROCESSORS  1
+#else
+#define CONFIGURE_MAXIMUM_PROCESSORS  4
+#endif
+
+#else // __RTEMS_MAJOR__  == 4 && __RTEMS_MINOR__ > 11
+
 #define CONFIGURE_SMP_APPLICATION
+
 #ifdef BSP_leon2
 #define CONFIGURE_SMP_MAXIMUM_PROCESSORS  1
 #else
 #define CONFIGURE_SMP_MAXIMUM_PROCESSORS  4
 #endif
+
+#endif
+
 #define CONFIGURE_INIT_TASK_ATTRIBUTES RTEMS_FLOATING_POINT
 #ifndef DEFINE_VARS
 #define GLOBAL