1 files changed, 16 insertions, 2 deletions

diff --git a/m4/unlocked-io.m4 b/m4/unlocked-io.m4
index f8e98f1d..6cbacb00 100644
--- a/m4/unlocked-io.m4
+++ b/m4/unlocked-io.m4
@@ -1,4 +1,11 @@
-#serial 8 -*- autoconf -*-
+# unlocked-io.m4 serial 12
+
+# Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 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
@@ -8,8 +15,15 @@ dnl (because some of them were declared in Solaris 2.5.1 but were removed
 dnl in Solaris 2.6, whereas we want binaries built on Solaris 2.5.1 to run
 dnl on Solaris 2.6).
 
-AC_DEFUN([jm_FUNC_GLIBC_UNLOCKED_IO],
+AC_DEFUN([gl_FUNC_GLIBC_UNLOCKED_IO],
 [
+  AC_LIBSOURCES([unlocked-io.h])
+
+  AC_DEFINE([USE_UNLOCKED_IO], 1,
+    [Define to 1 if you want getc etc. to use unlocked I/O if available.
+     Unlocked I/O can improve performance in unithreaded apps,
+     but it is not safe for multithreaded apps.])
+
   dnl Persuade glibc and Solaris <stdio.h> to declare
   dnl fgets_unlocked(), fputs_unlocked() etc.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])