Hi,
I'm trying to use boost like that

use-project boost : /path/to/boost ;

and it is working. But now I want to pass <cflags>-fPIC, I need boost to be compiled with it and do not want to write <target-os>linux:<library>boost/thread/<cflags>-fPIC.
I've tried to use

project : requeriments <cflags>-fPIC ;

but does not work anyway.

Any ideas?