frexpl: Update regarding AIX.

[gnulib.git] / m4 / pread.m4

diff --git a/m4/pread.m4 b/m4/pread.m4
index 50d9e4d..f1425a6 100644 (file)
--- a/m4/pread.m4
+++ b/m4/pread.m4
@@ -1,4 +1,4 @@
-# pread.m4 serial 1
+# pread.m4 serial 2
 dnl Copyright (C) 2009-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -7,6 +7,9 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_PREAD],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  dnl Persuade glibc <unistd.h> to declare pread().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
   AC_CHECK_FUNCS_ONCE([pread])
   if test $ac_cv_func_pread = no; then
     HAVE_PREAD=0