Bug#814606: libvigraimpex: FTBFS on armel (error: return type 'class std::future<void>')

[Ullrich Koethe]

>> so, please run cmake with the flag "-DWITH_BOOST_THREAD=1".
>
> Yup, that works.

Great. Ideally, we would like to activate this flag automatically for 
non-conforming compilers, or at least issue a warning. Is there a way 
for cmake to recognize your platform and toolchain?

> -- ** WARNING: You are compiling in C++98 mode.
> -- **          Multiarray tests will be skipped.
> -- **          Add -std=c++11 to CMAKE_CXX_FLAGS to enable multiarray tests.

If you want, you should be able to solve this by passing 
"-DCMAKE_CXX_FLAGS=-std=c++11" to cmake.

Best
Ulli