diff --git a/libgtkmm2.spec b/libgtkmm2.spec
index 655ea99..f536a72 100644
--- a/libgtkmm2.spec
+++ b/libgtkmm2.spec
@@ -2,7 +2,7 @@
 
 Name:          libgtkmm2
 Version:       2.24.4
-Release:       1mamba
+Release:       2mamba
 Summary:       gtkmm is the official C++ interface for the popular GUI library GTK+
 Group:         System/Libraries
 Vendor:        openmamba
@@ -64,7 +64,7 @@ This package contains static libraries and header files need for development.
 %setup -q -n gtkmm-%{version}
 
 %configure
-%make
+%make CXXFLAGS="${CXXFLAGS} -std=gnu++11"
 
 
 %install
@@ -98,6 +98,9 @@ This package contains static libraries and header files need for development.
 %{_libdir}/pkgconfig/gtkmm-*.pc
 
 %changelog
+* Thu Dec 10 2015 Silvan Calarco <silvan.calarco@mambasoft.it> 2.24.4-2mamba
+- rebuilt with gcc 5.2.0
+
 * Thu Jul 04 2013 Automatic Build System <autodist@mambasoft.it> 2.24.4-1mamba
 - automatic version update by autodist