Build the libraries? I understand what that means. How do I do that?
Read the manual: If regex is all you want to build, there are detailed instructions here: http://www.boost.org/libs/regex/doc/install.html#vc These are a little out of date and refer to vc6, but later versions use the same process, just substitute the appropriate makefile name (vc71.mak instead of vc6.mak). Alternatively follow the Boost-wide getting started instructions here: http://www.boost.org/more/getting_started.html#Preparation Finally, as someone else suggested you can add the regex source files (in libs/regex/src) directly to your project if you'd rather (you may end up linking in things you don't actually need if you do this however), you will need to define BOOST_REGEX_NO_LIB as a project wide define (under preprocessor options in your IDE) to stop the auto-linking kicking in if you go this route. John.