1. I have been built one sub library as below successfully: b2 locale toolset=msvc address-model=64 link=static threading=multi runtime-link=shared variant=release 2. Then, I tried to run: b2 stage Unexpectedly, it'll build other sub libraries, instead of copy the built sub sub library to the stage directory as the document says. Is there any automatic way to get the final built result in one directory?