Anyway, it did not work :/
I'm still unable to detect why Boost.Fiber is not getting compiled by
the Boost system, even though --with-fiber is clearly stated.
Boost.Thread, boost.Context and all the other boost libs dependencies are built.
could you post the complete output of 'b2 toolset=gcc architecture=arm address-model=32 binary-format=elf abi=aapcs --with-fiber'