diff --git a/gtk-sharp.spec b/gtk-sharp.spec
index 82a938e..ad221cb 100644
--- a/gtk-sharp.spec
+++ b/gtk-sharp.spec
@@ -2,7 +2,7 @@
 
 Name:          gtk-sharp
 Version:       2.99.3
-Release:       1mamba
+Release:       2mamba
 Summary:       A set of .NET bindings for the GTK+ toolkit and assorted GNOME libraries
 Group:         Development/Languages
 Vendor:        openmamba
@@ -81,11 +81,14 @@ This package contains the documentation for development.
 %patch3 -p1
 %patch4 -p1
 
+sed -i "s|gmcs|dmcs|" configure
+
 %build
 #autoreconf -fi
 %configure
 %make -j1 \
-   GACUTIL_FLAGS="/package %{name}-3.0 /gacdir %{_prefix}/lib /root %{buildroot}%{_prefix}/lib"
+   GACUTIL_FLAGS="/package %{name}-3.0 /gacdir %{_prefix}/lib /root %{buildroot}%{_prefix}/lib" \
+   GMCS=mcs
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
@@ -162,6 +165,9 @@ exit 0
 %{_prefix}/lib/monodoc/sources/%{name}*
 
 %changelog
+* Sun Dec 27 2015 Silvan Calarco <silvan.calarco@mambasoft.it> 2.99.3-2mamba
+- rebuilt with mono 4.2.2.4
+
 * Sat Jun 07 2014 Automatic Build System <autodist@mambasoft.it> 2.99.3-1mamba
 - automatic version update by autodist