https://svn.boost.org/trac10/ticket/11834 <p> I am trying to use boost chromo library inside Mac Xcode 7.1.1. I am able to compile header only project and I have been able to use the regex library. But with the chrono library I receive the falling error: </p> <p> Undefined symbols for architecture x86_64: </p> <blockquote> <p> "boost::system::system_category()", referenced from: </p> <blockquote> <p> <span class="underline">_cxx_global_var_init2 in main.o </span></p> </blockquote> <p> "boost::system::generic_category()", referenced from: </p> <blockquote> <p> <span class="underline">_cxx_global_var_init in main.o </span>_cxx_global_var_init1 in main.o </p> </blockquote> </blockquote> <p> ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/11834 Trac 1.4.3 banslug2001@… Tue, 08 Dec 2015 15:37:16 GMT https://svn.boost.org/trac10/ticket/11834 https://svn.boost.org/trac10/ticket/11834 <ul> <li><strong>attachment</strong> → <span class="trac-field-new">main.cpp</span> </li> </ul> <p> main.cpp </p> Ticket John Maddock Tue, 22 Dec 2015 17:06:57 GMT https://svn.boost.org/trac10/ticket/11834#comment:1 https://svn.boost.org/trac10/ticket/11834#comment:1 <ul> <li><strong>owner</strong> set to <span class="trac-author">Beman Dawes</span> </li> <li><strong>component</strong> <span class="trac-field-old">None</span> → <span class="trac-field-new">system</span> </li> </ul> <p> Are you linking to libboost_system? </p> Ticket