headers: make check of system header explicit

[gnulib.git] / m4 / sys_select_h.m4

diff --git a/m4/sys_select_h.m4 b/m4/sys_select_h.m4
index a652dac..6ce09db 100644 (file)
--- a/m4/sys_select_h.m4
+++ b/m4/sys_select_h.m4
@@ -1,5 +1,5 @@
-# sys_select_h.m4 serial 9
-dnl Copyright (C) 2006-2009 Free Software Foundation, Inc.
+# sys_select_h.m4 serial 10
+dnl Copyright (C) 2006-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -45,13 +45,14 @@ AC_DEFUN([gl_HEADER_SYS_SELECT],
           ])
       fi
     ])
+  AC_CHECK_HEADERS_ONCE([sys/select.h])
+  gl_CHECK_NEXT_HEADERS([sys/select.h])
   if test $ac_cv_header_sys_select_h = yes; then
     HAVE_SYS_SELECT_H=1
   else
     HAVE_SYS_SELECT_H=0
   fi
   AC_SUBST([HAVE_SYS_SELECT_H])
-  gl_CHECK_NEXT_HEADERS([sys/select.h])
   if test $gl_cv_header_sys_select_h_selfcontained != yes; then
     gl_PREREQ_SYS_H_WINSOCK2
   fi