This patch removes a workaround against a problem that was fixed on 2007-11-01.
2020-08-14 Bruno Haible <br...@clisp.org>
mktime, mktime-internal: Remove obsolete code.
* m4/mktime.m4 (gl_FUNC_MKTIME_WORKS): Don't #undef putenv.
diff --git a/m4/mktime.m4 b/m4/mktime.m4
index afc8a87..917e759 100644
--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -1,4 +1,4 @@
-# serial 33
+# serial 34
dnl Copyright (C) 2002-2003, 2005-2007, 2009-2020 Free Software Foundation,
dnl Inc.
dnl This file is free software; the Free Software Foundation
@@ -58,9 +58,6 @@ AC_DEFUN([gl_FUNC_MKTIME_WORKS],
# define TIME_T_IS_SIGNED 0
#endif
-/* Work around redefinition to rpl_putenv by other config tests. */
-#undef putenv
-
static time_t time_t_max;
static time_t time_t_min;
