Boost C++ Libraries: Ticket #13471: Documentation warnings in Xcode 9.2 https://svn.boost.org/trac10/ticket/13471 <p> Xcode shows documentation warnings when I include &lt;boost/process.hpp&gt; screenshot : <a class="ext-link" href="https://imgur.com/Uq6BsMu"><span class="icon">​</span>https://imgur.com/Uq6BsMu</a> </p> <p> Belows are my xcode project settings. </p> <p> Hearder Search Paths /usr/local/include/ Library Search Paths /usr/local/lib/ Other Linker Flags = -lboost_system -lboost_filesystem </p> en-us Boost C++ Libraries /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/13471 Trac 1.4.3