[glib] docs: Mention TZDIR

[Emmanuele Bassi <ebassi src gnome org>]

commit d62eb80c5489bbd4590c10f218b9eb71393bdfaf
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Tue Aug 24 21:37:43 2010 +0100

    docs: Mention TZDIR
    
    The timezone code in GDateTime honours the TZDIR environment variable,
    so it should be mentioned in the list of variables GLib checks at
    runtime.

 docs/reference/glib/running.sgml |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/glib/running.sgml b/docs/reference/glib/running.sgml
index ea10d15..a130e66 100644
--- a/docs/reference/glib/running.sgml
+++ b/docs/reference/glib/running.sgml
@@ -202,6 +202,17 @@ variables like <envar>LANG</envar>, <envar>PATH</envar> or <envar>HOME</envar>.
   </para>
 </formalpara> 
 
+<formalpara id="TZDIR">
+  <title><envar>TZDIR</envar></title>
+
+  <para>
+    Allows to specify a nonstandard location for the timezone data files
+    that are used by the #GDateTime API. The default location is under
+    <filename>/usr/share/zoneinfo</filename>. For more information,
+    also look at the <command>tzset</command> manual page.
+  </para>
+</formalpara>
+
 </refsect2>
 
 <refsect2 id="setlocale">