--- djvulibre-3.5.21.org/configure	2009-01-16 20:59:06.000000000 +0530
+++ djvulibre-3.5.21/configure	2009-01-16 20:57:27.000000000 +0530
@@ -21691,6 +21691,7 @@
 __sync_lock_test_and_set(&l,1);
   __sync_lock_release(&l);
   __sync_add_and_fetch(&l,1);
+  __sync_bool_compare_and_swap(&l,&l,1);
   return 0;
   ;
   return 0;