Mac XCode program 1. Add additional header/libraries For XCode project, add the "Header Search Paths" or "Library Search Paths" under "Search Paths" in xcodeproj. 2. Add additional link flags For XCode project, for example, add "-lboost_system-xgcc42-1_51" and "-lboost_filesystem-xgcc42-1_51" under "Other Linker Flags".