(sync) [!HAVE_SYNC]: New macro.

diff --git a/src/system.h b/src/system.h
index 09b94c13c76bafaabd378c7f795669c465dc8107..ab4826682ec4410cd914cf6b022cf783739b3c5f 100644 (file)
--- a/src/system.h
+++ b/src/system.h
@@ -765,6 +765,10 @@ enum
                          : (errno = EOVERFLOW, -1))
 #endif
 
+#if ! HAVE_SYNC
+# define sync() /* empty */
+#endif
+
 /* Compute the greatest common divisor of U and V using Euclid's
    algorithm.  U and V must be nonzero.  */