Hi, I'm trying to compile my code with boost.thread from SVN trunk (gcc 4.1.2, Fedora 7). I get the following error : /include/boost/thread/pthread/tss.hpp:55: error: invalid conversion from void* to MyThread* The code being compiled creates a thread_specific_ptr with a custom cleanup function, and is OK with boost 1.34 . Looking at the specified header, in line 55 there is a call to the custom cleanup_function: void operator()(void* data) { cleanup_function(data); } It seems like a static_cast<T*> is missing in the parameter. I changed it locally and the problem was solved. Can anyone confirm this problem ? Thanks, Luiz Marques