need to point the bootstrap process ( all stages ? ) to slightly non-standard include location

[Marc Glisse]

On Thu, 27 Dec 2018, Dennis Clarke wrote:

>> Is multiarch enabled in your build?
>
> No.

Well it should be. I would expect it to be automatically detected, but it 
can also be enabled manually to make sure. Though I think it is only 
visible when you run make and it runs configure in the subdirectory gcc/.

Multiarch is how it is called when some headers are not in /usr/include 
but in /usr/include/$triplet.

-- 
Marc Glisse