I would like to be able to specify a flag multiple times on the command line. For instance, imagine a program that has two levels of verbosity. The first level of verbosity would be activated by specifying "-v" on the command line, and the second level of verbosity would be activated by specifying "-vv" or "-v -v" on the command line. Display verbose print statements: myProgram -v Display very verbose print statements: myProgram -vv In digging through the documentation, it is not evident to me how I can accomplish this with Boost.Program_Options. Any help would be appreciated. Thanks, Justin