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two distinct build systems sometimes conducted to two distinct binary 
distributions, for instance, when compared to Debian/Ubuntu deliveries.

Note that upstream Boost has decided, at the end of 2012, to switch to:
 Git repository, with GitHub as one of the main hosting services and project 
 management facilities
 (later on, when the switch to Git will be stable enough) a modularized 
 organisation, and
 CMake as the primary build system, replacing BJam/BBuild 

The objective is now to keep delivering the latest stable Boost release for 
each new Fedora release.