Thanks, John and Aaron. In the meantime everything works and I have written a little installation guide. If you find any mistakes or improvements, please let me know. Richard Kaiser 1.1 Installing the Boost Libraries in Windows Since the installation of the Boost library is not that trivial, we present it for boost version 1.33. For more detailed information, consult the installation instructions from www.boost.org. a) Download the current Boost version from http://www.boost.org For the rest of this section we assume, that boost_1_33_0.zip (version 1.33.0) was unzipped into the directory c:\boost Since the installation routine from b) requires and creates the directory c:\boost, it is recommended to use exactly this name and no other one, although this is also possible. Unzipping creates the directory c:\boost\boost_1_33_0 Enter this directory in C++Builder under Project|Options|C++Compiler/¬Paths and Defines|Include search path. b) The installation steps from a) are sufficient for most Boost libraries, but not for all. This second part b) is more time consuming. b1) Download boost-jam. For Boost version 1.33 this is boost-jam-3.1.11-1-ntx86.zip. Follow the link on the “Getting Started” page (or the like). Unzip bjam.exe into the directory c:\boost\boost_1_33_0 b2) Start a Microsoft Command Processor cmd.exe (Start|Programs|¬Accesso¬ries|¬Command Prompt, using 4DOS or Take Command will not work). If there is no path set to your compilers bin directory, set one with a statement like PATH=%PATH%;c:\CBuilder\bin or PATH=%PATH%;c:\MinGW\bin b3) Under cmd.exe, in the directory c:\boost\boost_1_33_0, execute bjam "-sTOOLS=borland" install or bjam "-sTOOLS=mingw" install On my 1.7 GHz machine this took about 2 (BCB6) or 6 hours (MinGW). It creates the directory c:\boost\lib with about 200 MB (BCB6) or 1600 MB (MinGW) lib- and dll libraries. The names of these libraries are composed from the libraries to which they belong, the compiler (e.g. “bcb” for Borland C++Builder) and further symbols like “mt” for multithread, “s” for static and “d” for debug libraries. In addition, bjam creates the directory c:\boost\include. It contains essentially the same files as c:\boost\boost_1_31_0\include. To use the Boost libraries with Borland C++Builder 6, enter the library to your project by using Project|Add to Project. To use the Boost libraries with MinGW GNU C++, enter e.g. g++ -Ic:\boost\boost_1_33_0 -Lc:\boost\lib -llibboost_unit_test_framework-mgw-sd unit_test_example1.cpp Note: Do not enter a .lib extension for the lib file although this lib file has such an extension.