Adding MAKEFLAGS from MPC(The Makefile, Project, and Workspace Creator)

I am using MPC to generate my makefiles. I generate successfully the Makefile but when I run make I get the following error:

error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.

My question is, how to add build flags (eg:-std=c++11) to my MPC?

For completion here is my MPC file:

project(Makefile) : dcpsexe, dcps_tcp {
   requires += no_opendds_safety_profile
   exename   = start
   after    += *idl

   TypeSupport_Files {
     Communication.idl
   }

   Source_Files {
     ListenerReader.cpp
     Publisher.cpp
     Subscriber.cpp
     main.cpp    
   }
}