-# unistd_h.m4 serial 52
+# unistd_h.m4 serial 53
dnl Copyright (C) 2006-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_REQUIRE([AC_C_INLINE])
gl_CHECK_NEXT_HEADERS([unistd.h])
-
- AC_CHECK_HEADERS_ONCE([unistd.h])
if test $ac_cv_header_unistd_h = yes; then
HAVE_UNISTD_H=1
else