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diff --git a/m4/fpending.m4 b/m4/fpending.m4
new file mode 100644
index 0000000..fecf3f3
--- /dev/null
+++ b/m4/fpending.m4
@@ -0,0 +1,83 @@
+# serial 15
+
+# Copyright (C) 2000-2001, 2004-2009 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+dnl From Jim Meyering
+dnl Using code from emacs, based on suggestions from Paul Eggert
+dnl and Ulrich Drepper.
+
+dnl Find out how to determine the number of pending output bytes on a stream.
+dnl glibc (2.1.93 and newer) and Solaris provide __fpending.  On other systems,
+dnl we have to grub around in the FILE struct.
+
+AC_DEFUN([gl_FUNC_FPENDING],
+[
+  AC_CHECK_HEADERS_ONCE([stdio_ext.h])
+  AC_CHECK_FUNCS_ONCE([__fpending])
+  fp_headers='
+#     include <stdio.h>
+#     if HAVE_STDIO_EXT_H
+#      include <stdio_ext.h>
+#     endif
+'
+  AC_CHECK_DECLS([__fpending], , , $fp_headers)
+  if test $ac_cv_func___fpending = no; then
+    AC_CACHE_CHECK(
+	      [how to determine the number of pending output bytes on a stream],
+		   ac_cv_sys_pending_output_n_bytes,
+      [
+	for ac_expr in							  \
+									  \
+	    '# glibc2'							  \
+	    'fp->_IO_write_ptr - fp->_IO_write_base'			  \
+									  \
+	    '# traditional Unix'					  \
+	    'fp->_ptr - fp->_base'					  \
+									  \
+	    '# BSD'							  \
+	    'fp->_p - fp->_bf._base'					  \
+									  \
+	    '# SCO, Unixware'						  \
+	    '(fp->__ptr ? fp->__ptr - fp->__base : 0)'			  \
+									  \
+	    '# QNX'							  \
+	    '(fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0)' \
+									  \
+	    '# old glibc?'						  \
+	    'fp->__bufp - fp->__buffer'					  \
+									  \
+	    '# old glibc iostream?'					  \
+	    'fp->_pptr - fp->_pbase'					  \
+									  \
+	    '# emx+gcc'							  \
+	    'fp->_ptr - fp->_buffer'					  \
+									  \
+	    '# VMS'							  \
+	    '(*fp)->_ptr - (*fp)->_base'				  \
+									  \
+	    '# e.g., DGUX R4.11; the info is not available'		  \
+	    1								  \
+	    ; do
+
+	  # Skip each embedded comment.
+	  case "$ac_expr" in '#'*) continue;; esac
+
+	  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
+	    [[FILE *fp = stdin; (void) ($ac_expr);]])],
+	    [fp_done=yes]
+	  )
+	  test "$fp_done" = yes && break
+	done
+
+	ac_cv_sys_pending_output_n_bytes=$ac_expr
+      ]
+    )
+    AC_DEFINE_UNQUOTED([PENDING_OUTPUT_N_BYTES],
+      $ac_cv_sys_pending_output_n_bytes,
+      [the number of pending output bytes on stream `fp'])
+    AC_LIBOBJ([fpending])
+  fi
+])