--- coreutils-8.21.orig/lib/fseeko.c	2013-01-04 15:07:03.000000000 +0100
+++ coreutils-8.21/lib/fseeko.c	2013-11-04 20:32:38.000000000 +0100
@@ -99,6 +99,12 @@ fseeko (FILE *fp, off_t offset, int when
 #elif defined EPLAN9                /* Plan9 */
   if (fp->rp == fp->buf
       && fp->wp == fp->buf)
+#elif FUNC_FFLUSH_STDIN < 0 && 200809 <= _POSIX_VERSION
+  /* Cross-compiling to some other system advertising conformance to
+     POSIX.1-2008 or later.  Assume fseeko and fflush work as advertised.
+     If this assumption is incorrect, please report the bug to
+     bug-gnulib.  */
+  if (0)
 #else
   #error "Please port gnulib fseeko.c to your platform! Look at the code in fpurge.c, then report this to bug-gnulib."
 #endif