Add -std=gnu++11 flag

msgpack.spec

@@ -40,7 +40,7 @@ if test ! -e "obj"; then
   mkdir obj
 fi
 pushd obj
-
+export CXXFLAGS="%{build_cxxflags} -std=gnu++11"
 %cmake .. -DCMAKE_INSTALL_LIBDIR=%{_libdir} -Dlibdir=%{_libdir} -DBUILD_SHARED_LIBS=ON
 %make_build
 
@@ -64,7 +64,6 @@ make install/fast DESTDIR=$RPM_BUILD_ROOT -C obj
 
 
 %files
-%{!?_licensedir:%global license %doc}
 %license LICENSE_1_0.txt COPYING
 %doc AUTHORS ChangeLog NOTICE README README.md
 %{_libdir}/*.so.*