Can you please name a few compilers that implement bool?
Almost every C++ compiler nowadays supports bool. You don’t have to define or #include anything; bool is a standard keyword and so are true and false. Visual C++ 5.0 supports bool. You’re probably using an older version of Visual C++ or using an uppercase BOOL, which is not the same as lowercase bool: the former is a Windows-specfic typedef, whereas the latter is a C++ keyword.
Recent versions of GCC (2.95 and above) also support bool. You probably need to upgrade your compiler.