http://gcc.gnu.org/ml/gcc/2003-04/msg00518.html

--- a/lib/regex.c
+++ b/lib/regex.c
@@ -8184,7 +8184,7 @@
       if (msg_size > errbuf_size)
         {
 #if defined HAVE_MEMPCPY || defined _LIBC
-	  *((char *) __mempcpy (errbuf, msg, errbuf_size - 1)) = '\0';
+	  *((char *) mempcpy (errbuf, msg, errbuf_size - 1)) = '\0';
 #else
           memcpy (errbuf, msg, errbuf_size - 1);
           errbuf[errbuf_size - 1] = 0;