Hello, Today Boost does not provide any backward binary compatibility. This makes big problems in shipping 3rd part libraries that depend on Boost because library user must use the same version of Boost as that 3rd part library was compiled with. The problem is become even more critical for ELF platforms (UNIXes) where all symbols are exported by default. I had written a small Python script that switches boost namespace to other, allowing 3rd part project include it without collisions with primary Boost namespace. The script passes over the source tree of boost and changes each include path from <boost/foo/bar.hpp> too <newnamespace/foo/bar.hpp> and renames all macros and identifiers from some_BOOST_something to some_NEWNAMESPACE_something and some_boost_something to some_newnamespace_something. It does not touch comments (copyright) and strings unless the string is in form "boost/.*" which is usually some reference for include. I've run this script on the 1.39 version of boost and successfully build full boost release and run some of regression tests like Boost.Asio, Boost.Regex, Boost.Function and others, The source code is available at: http://art-blog.no-ip.info/files/rename.py You run it as: ./rename /path/to/boost/source new_namespace_name It renames all macros and namespaces to new namespace, and renames main include directory to new_namespace_na,e. Few points: 1. It is only alpha version script, I just want to see feedback and proposals 2. I do not update build scripts. I assume that each library that tryes to import its own version of Boost would provide its own build system. 3. The build scripts should be updated differently because they have different syntax and grammar. The required changes are to fix different build defines Please, give feedback proposal. If there someone who is familiar with Boost.Build systems can actually help, this would be very good. Today there is a big problem with working with different versions of Boost. It should be solved. I think this script may be a valuable addition to Boost.BCP utility that allows extracting a subset of boost for integration in 3rd part tools and libraries. Thanks, Artyom