diff --git a/xsoft/other/thunderbird.xml b/xsoft/other/thunderbird.xml
index e5d5490c11..8de02140d5 100644
--- a/xsoft/other/thunderbird.xml
+++ b/xsoft/other/thunderbird.xml
@@ -252,6 +252,13 @@ test $(uname -m) = "i686" && sed -i 's/enable-optimize/disable-optimize/' mozcon
       commands:
     </para>
 
+    <para>
+      If you have installed version 2.1.8 or newer of libevent, fix a file:
+    </para>
+
+<screen><userinput>sed -e s/_EVENT_SIZEOF/EVENT__SIZEOF/ \
+    -i mozilla/ipc/chromium/src/base/message_pump_libevent.cc</userinput></screen>
+
     <note><para>
       If you are compiling <application>Thunderbird</application> in chroot,
       prepend <envar>SHELL=/bin/sh</envar> to the make command below.