diff --git a/kdebindings-4.5.2-mono28.patch b/kdebindings-4.5.2-mono28.patch
new file mode 100644
index 0000000..475eac5
--- /dev/null
+++ b/kdebindings-4.5.2-mono28.patch
@@ -0,0 +1,12 @@
+diff -up kdebindings-4.5.2/csharp/kimono/CMakeLists.txt.mono28 kdebindings-4.5.2/csharp/kimono/CMakeLists.txt
+--- kdebindings-4.5.2/csharp/kimono/CMakeLists.txt.mono28	2010-05-20 06:43:57.000000000 -0500
++++ kdebindings-4.5.2/csharp/kimono/CMakeLists.txt	2010-10-23 14:50:51.696379925 -0500
+@@ -22,7 +22,7 @@ TARGET_LINK_LIBRARIES(kimono qyoto smoke
+                       ${KDE4_KDECORE_LIBS} ${KDE4_KIO_LIBS})
+ 
+ # write FindPackage modules for these
+-pkg_search_module(LIBMONO mono)
++pkg_search_module(LIBMONO mono-2 mono)
+ pkg_search_module(GLIB2 glib-2.0)
+ 
+ macro_log_feature(LIBMONO_FOUND "libmono" "Mono library" "http://www.mono-project.com" FALSE "" "Required to compile kimonopluginfactory")
diff --git a/kdebindings.spec b/kdebindings.spec
index 85bd02b..a974d7d 100644
--- a/kdebindings.spec
+++ b/kdebindings.spec
@@ -8,12 +8,10 @@
 # php, ruby and csharp depend on smoke
 %define php 1
 %define ruby 1
-%if 0%{?fedora} < 15
 # arch'es matching mono's Arch set
 %ifnarch sparc64
 %define csharp 1
 %endif
-%endif
 %define java 0
 %endif
 
@@ -54,12 +52,15 @@ BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 ## upstreamable patches
 # fix build with newer sip/PyQt (borrowed from opensuse)
 Patch51: kdebindings-4.5.1-sip_api_8.patch
-# fix errors found by valgrind
-Patch52: kdebindings-4.5.2-generator-invalid-reads.patch
 
 ## upstream patches
+# fix errors found by valgrind
+Patch100: kdebindings-4.5.2-generator-invalid-reads.patch
 
-## 4.5 branch
+## trunk
+# kdebindings-csharp fails to build with mono 2.8, http://bugs.kde.org/254629
+# should backport this if not already done
+Patch150: kdebindings-4.5.2-mono28.patch 
 
 BuildRequires:  akonadi-devel
 BuildRequires:  kdebase-workspace-devel >= %{version}
@@ -270,7 +271,8 @@ Falcon plugin for the Kross archtecture in KDE4.
 %if 0%{?_sip_api_major} >= 8
 %patch51 -p1 -b .sip_api_8
 %endif
-%patch52 -p1 -b .generator_invalid_reads
+%patch100 -p1 -b .generator_invalid_reads
+%patch150 -p1 -b .mono28
 
 
 %build
@@ -560,7 +562,6 @@ fi
 %changelog
 * Sat Oct 23 2010 Rex Dieter <rdieter@fedoraproject.org> - 4.5.2-4
 - rebuild (sip/PyQt4)
-- disable broken mono (f15+)
 
 * Wed Oct 20 2010 Rex Dieter <rdieter@fedoraproject.org> - 4.5.2-3
 - No ABI check in php-qt (#644914)