$NetBSD: patch-ab,v 1.7 2008/04/29 13:54:55 wiz Exp $

--- lib/freadahead.c.orig	2008-03-10 19:11:22 -0700
+++ lib/freadahead.c	2008-04-14 17:38:46 -0700
@@ -78,6 +78,8 @@
 	 + (fp->_Mode & 0x4000 /* _MBYTE */
 	    ? (fp->_Back + sizeof (fp->_Back)) - fp->_Rback
 	    : 0);
+#elif defined __DragonFly__	    /* DragonFly */
+  return __sreadahead(fp);
 #else
  #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
 #endif