[evolution] Bug #642121 - Won't build with --with-clutter due missing include

[Milan Crha <mcrha src gnome org>]

commit c4c8f03b0abf6bda8ebbbcce520fa4ee4ed73c29
Author: Dan Vrátil <dvratil redhat com>
Date:   Fri Feb 18 10:10:47 2011 +0100

    Bug #642121 - Won't build with --with-clutter due missing include

 mail/e-mail-notebook-view.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/mail/e-mail-notebook-view.c b/mail/e-mail-notebook-view.c
index cf957c3..8dc5730 100644
--- a/mail/e-mail-notebook-view.c
+++ b/mail/e-mail-notebook-view.c
@@ -40,6 +40,7 @@
 #include <clutter/clutter.h>
 #include <mx/mx.h>
 #include <clutter-gtk/clutter-gtk.h>
+#include <math.h>
 
 #include "e-mail-tab-picker.h"
 #endif