diff --git a/libgcc/config/gthr-vxworks-cond.c b/libgcc/config/gthr-vxworks-cond.c
index 65f0a6af183a..ba384b433c43 100644
--- a/libgcc/config/gthr-vxworks-cond.c
+++ b/libgcc/config/gthr-vxworks-cond.c
@@ -26,6 +26,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    This file implements the GTHREAD_HAS_COND part of the interface
    exposed by gthr-vxworks.h.  */
 
+#if __GTHREAD_HAS_COND
+
 #include "gthr.h"
 #include <taskLib.h>
 
@@ -79,3 +81,5 @@ __gthread_cond_wait_recursive (__gthread_cond_t *cond,
 {
   return __gthread_cond_wait (cond, mutex);
 }
+
+#endif
diff --git a/libgcc/config/gthr-vxworks.h b/libgcc/config/gthr-vxworks.h
index e38174730bf0..d49809a9c2cb 100644
--- a/libgcc/config/gthr-vxworks.h
+++ b/libgcc/config/gthr-vxworks.h
@@ -234,6 +234,12 @@ extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);
 
 /* ------------------ Base condition variables support ------------------- */
 
+/* VxWorks prio to 6 misses a few services key to a correct
+   implementation of condition variables with reasonable complexity.
+   semExchange in particular.  */
+
+#if _VXWORKS_MAJOR_GE(6)
+
 #define __GTHREAD_HAS_COND 1
 
 typedef SEM_ID __gthread_cond_t;
@@ -254,6 +260,8 @@ extern int __gthread_cond_wait (__gthread_cond_t *cond,
 extern int __gthread_cond_wait_recursive (__gthread_cond_t *cond,
 					  __gthread_recursive_mutex_t *mutex);
 
+#endif
+
 /* -----------------------  C++0x thread support ------------------------- */
 
 /* We do not support C++0x threads on that VxWorks 653, which we can