# HG changeset patch
# User Jim Meyering <jim@meyering.net>
# Date 908400472 0
# Node ID a52b4052a5b9fab8a44849e020c2509bbaa7885b
# Parent  d086e834be7d9b4ba54abfecb89477f491a74a37
Use the more portable "TZ=PST8PDT,M4.1.0,M10.5.0"
instead of "TZ=America/Vancouver".  From Paul Eggert.

diff --git a/m4/mktime.m4 b/m4/mktime.m4
--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -50,7 +50,12 @@
 {
   /* glibc (up to about 1998-10-07) failed this test) */
   struct tm tm;
-  putenv ("TZ=America/Vancouver");
+
+  /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
+     instead of "TZ=America/Vancouver" in order to detect the bug even
+     on systems that don't support the Olson extension, or don't have the
+     full zoneinfo tables installed.  */
+  putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
   tm.tm_year = 98;
   tm.tm_mon = 3;
   tm.tm_mday = 5;