diff -r ca03a6737cb7 -r 72a4e043e67d master/globals.h
--- a/master/globals.h	Thu Jan 06 12:47:20 2011 +0100
+++ b/master/globals.h	Thu Jan 06 13:11:21 2011 +0100
@@ -40,9 +40,10 @@
 #include "../include/ecrt.h"
 
 #ifdef __KERNEL__
-#ifdef EC_USE_MUTEX
+#include <linux/version.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
 #include <linux/rtmutex.h>
-#endif  // EC_USE_MUTEX
+#endif  // KERNEL_VERSION(2,6,24)
 #endif // __KERNEL__
 
 /******************************************************************************
@@ -318,7 +319,7 @@
 /** Mutual exclusion helpers.
  *
  */
-#ifdef EC_USE_MUTEX
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
 #define ec_mutex_t rt_mutex
 static inline void ec_mutex_init(struct ec_mutex_t *mutex)
 {
@@ -340,7 +341,7 @@
 {
     rt_mutex_unlock(mutex);
 }
-#else   // EC_USE_MUTEX
+#else   // < KERNEL_VERSION(2,6,24)
 #define ec_mutex_t semaphore
 static inline void ec_mutex_init(struct ec_mutex_t *sem)
 {
@@ -364,7 +365,7 @@
     up(sem);
 }
 
-#endif // EC_USE_MUTEX
+#endif // KERNEL_VERSION(2,6,24)
 #endif // __KERNEL__
 
 #endif