--- a/Python/thread_pthread.h	Sun Dec 02 08:14:50 2012 +0100
+++ b/Python/thread_pthread.h	Sun Dec 02 08:37:00 2012 +0100
@@ -309,6 +309,7 @@
     sem_t *thelock = (sem_t *)lock;
     int status, error = 0;
 
+    (void) error; /* silence unused-but-set-variable warning */
     dprintf(("PyThread_free_lock(%p) called\n", lock));
 
     if (!thelock)
@@ -341,6 +342,7 @@
     int status, error = 0;
     struct timespec ts;
 
+    (void) error; /* silence unused-but-set-variable warning */
     dprintf(("PyThread_acquire_lock_timed(%p, %lld, %d) called\n",
              lock, microseconds, intr_flag));
 
@@ -391,6 +393,7 @@
     sem_t *thelock = (sem_t *)lock;
     int status, error = 0;
 
+    (void) error; /* silence unused-but-set-variable warning */
     dprintf(("PyThread_release_lock(%p) called\n", lock));
 
     status = sem_post(thelock);