diff --git a/evolution-3.5.5-libxml2.patch b/evolution-3.5.5-libxml2.patch
new file mode 100644
index 0000000..51ac89b
--- /dev/null
+++ b/evolution-3.5.5-libxml2.patch
@@ -0,0 +1,57 @@
+From ff88d1f11176233438cace72da46a54c479495ab Mon Sep 17 00:00:00 2001
+From: Matthew Barnes <mbarnes@redhat.com>
+Date: Mon, 13 Aug 2012 15:41:10 +0000
+Subject: Bug 681321 - Support both old and new-buf libxml2 APIs
+
+libxml2 changed the API for xmlOutputBuffer incompatibly.
+See https://mail.gnome.org/archives/desktop-devel-list/2012-August/msg00004.html
+---
+diff --git a/modules/cal-config-caldav/e-caldav-chooser.c b/modules/cal-config-caldav/e-caldav-chooser.c
+index 55143f0..fa5c9b7 100644
+--- a/modules/cal-config-caldav/e-caldav-chooser.c
++++ b/modules/cal-config-caldav/e-caldav-chooser.c
+@@ -111,6 +111,19 @@ G_DEFINE_DYNAMIC_TYPE_EXTENDED (
+ 		E_TYPE_SOURCE_AUTHENTICATOR,
+ 		e_caldav_chooser_authenticator_init))
+ 
++static gconstpointer
++compat_libxml_output_buffer_get_content (xmlOutputBufferPtr buf,
++                                         gsize *out_len)
++{
++#ifdef LIBXML2_NEW_BUFFER
++	*out_len = xmlOutputBufferGetSize (buf);
++	return xmlOutputBufferGetContent (buf);
++#else
++	*out_len = buf->buffer->use;
++	return buf->buffer->content;
++#endif
++}
++
+ static void
+ context_cancel_message (GCancellable *cancellable,
+                         Context *context)
+@@ -203,6 +216,8 @@ caldav_chooser_new_propfind (SoupSession *session,
+ 	xmlNodePtr node;
+ 	xmlNsPtr ns;
+ 	xmlOutputBufferPtr output;
++	gconstpointer content;
++	gsize length;
+ 	gpointer key;
+ 	va_list va;
+ 
+@@ -268,9 +283,11 @@ caldav_chooser_new_propfind (SoupSession *session,
+ 	xmlNodeDumpOutput (output, doc, root, 0, 1, NULL);
+ 	xmlOutputBufferFlush (output);
+ 
++	content = compat_libxml_output_buffer_get_content (output, &length);
++
+ 	soup_message_set_request (
+ 		message, "application/xml", SOUP_MEMORY_COPY,
+-		(gchar *) output->buffer->content, output->buffer->use);
++		content, length);
+ 
+ 	xmlOutputBufferClose (output);
+ 
+--
+cgit v0.9.0.2
+
diff --git a/evolution.spec b/evolution.spec
index b9130a2..44ad2c0 100644
--- a/evolution.spec
+++ b/evolution.spec
@@ -53,6 +53,9 @@ Patch02: evolution-2.30.1-help-contents.patch
 # commit ad93908, will be in Evo 3.5.90 - adamw
 Patch03: evolution-3.5.5-bgo678408.patch
 
+# Upstream ff88d1f11: fix build with new libxml2
+Patch04: evolution-3.5.5-libxml2.patch
+
 ## Dependencies ###
 
 Requires: gnome-icon-theme >= %{gnome_icon_theme_version}
@@ -194,6 +197,7 @@ This package contains the plugin to import Microsoft Personal Storage Table
 %patch01 -p1 -b .ldaphack
 %patch02 -p1 -b .help-contents
 %patch03 -p1 -b .bgo678408
+%patch04 -p1 -b .libxml2
 
 mkdir -p krb5-fakeprefix/include
 mkdir -p krb5-fakeprefix/lib
@@ -531,7 +535,7 @@ rm -rf $RPM_BUILD_ROOT
 
 %changelog
 * Wed Aug 15 2012 Adam Williamson <awilliam@redhat.com> - 3.5.5-2
-- backport the fix for BGO #678408
+- backport the fix for BGO #678408 and #681321 (libxml2 build)
 
 * Mon Aug 06 2012 Milan Crha <mcrha@redhat.com> - 3.5.5-1
 - Update to 3.5.5