I just developed a google protocol buffers library support module for boost build, and I am making this contribution available to everyone under the Boost License.
The usage is pretty simple.
add the following line in your user-config,jam
using pb : /usr/local ; # assuming google protocol buffers is installed in /usr/local
and in your Jamfile.
import pb ;
This is the first version, and it doesn't support auto-detection.
Rodrigo Pinho Pereira de Souza