--- a/configure
+++ b/configure
@@ -2637,10 +2637,6 @@
 # define __pure __attribute__((__pure__))
 #endif /* !__pure */
 
-#ifndef __unused
-# define __unused __attribute__((__unused__))
-#endif /* !__unused */
-
 #ifndef __used
 # define __used __attribute__((__used__))
 #endif /* !__used */
