[boost] different Problem cross-compiling against boost.context for Raspberry Pi (2)

Subject: [boost] different Problem cross-compiling against boost.context for Raspberry Pi (2)
From: Biddiscombe, John A. (biddisco_at_[hidden])
Date: 2015-06-16 04:45:13

When compiling HPX against the now built boost, I have this  error message

/home/biddisco/apps/boost-1_58_0/include/boost-1_58/boost/context/execution_context.hpp:202:52: error: ‘std::index_sequence’ has not been declared
                                               std::index_sequence< I ... >) {

index_sequence appears to be c++14, I'm using -std=c++11, 

can one tell if this likely a mistake on my part somewhere, or a possible problem with boost.context?
(Is there a BOOST_FLAG_SOMETHING, I should add to prevent t being used?)

thanks

JB