Hello, I am trying to build Boost for linking with an application. I do not have admin access and there is an existing older Boost version in the system area. My problem is that there are three thread symbols that do not get defined by my build process: undefined reference to `boost::thread::join()' undefined reference to `boost::thread::~thread()' undefined reference to `boost::thread::start_thread()' Google reveals that this problem has been around for a while but the usual remedy is to install some binary or other. I need to build from source but for the life of me I can't understand what I am doing wrong that these symbols are not being defined. I can search everything that is being built using "nm" and they just aren't there. I think I am using a pretty standard build process of first building Boost.Build, then the rest: ./bootstrap.sh --with-toolset=gcc ./b2 install --prefix=${PREFIX} ${PREFIX}/bin/b2 --prefix=${PREFIX} toolset=gcc install I have geared down to various forms of magic: stage and then install, --without-thread followed by --with-thread, but I must be missing something basic about these libraries which I do not have occasion to use routinely. The build scripts are a bit opaque but don't indicate any errors. I am a little surprised that this isn't in an FAQ somewhere but maybe not many of us build Boost from source. Thanks for any assistance. Ed