What to do when there's no timezone-ish file.

For: houseabsolute#13

lib/DateTime/TimeZone/Local/Unix.pm

@@ -331,4 +331,22 @@ If this file exists, it is opened and we look for a line starting like
 
 =back
 
+B<Note:>  Some systems such as virtual machine boxes may lack any of
+these files.  You can confirm that this is so by calling:
+
+    $ ls -l /etc/localtime /etc/timezone /etc/TIMEZONE \
+        /etc/sysconfig/clock /etc/default/init
+
+If this is the case, then when checking for timezone handling you are
+likely to get an exception:
+
+    $ perl -wle 'use DateTime; DateTime->now( time_zone => "local" )'
+    Cannot determine local time zone
+
+In that case, you should consult your system F<man> pages as to how to address
+that problem.  In one such case reported to us, a FreeBSD virtual machine had
+been built without any of these files.  The user was able to run the FreeBSD
+F<tzsetup> utility.  That installed F</etc/localtime>, after which the above
+timezone diagnostic ran silently, I<i.e.>, without throwing an exception.
+
 =cut