--- /dev/null
+dnl Time zone functions: tzalloc, localtime_rz, etc.
+
+dnl Copyright (C) 2015 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.
+
+dnl Written by Paul Eggert.
+
+AC_DEFUN([gl_TIME_RZ],
+[
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_REQUIRE([gl_HEADER_SYS_TIME_H_DEFAULTS])
+ AC_REQUIRE([AC_STRUCT_TIMEZONE])
+ AC_CHECK_FUNCS_ONCE([tzset])
+
+ AC_CHECK_TYPES([timezone_t], [], [], [[#include <time.h>]])
+ if test "$ac_cv_type_timezone_t" = yes; then
+ HAVE_TIMEZONE_T=1
+ fi
+])