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--- a/src/unac/unac.c
+++ b/src/unac/unac.c
@@ -13135,7 +13135,7 @@
  * compatibility hack introduced in some GNU/Linux distributions that
  * did not know UTF-16BE.
  */
-static const char* utf16be()
+static const char* utf16be(void)
 {
   iconv_t cd;
   static char* name = 0;