title: Unresolved externals using boost::asio(visual studio12, x64)
body: <p>I've downloaded and installed the boost_1_55_0-msvc-12.0-64.exe executable from here: <a href="http://sourceforge.net/projects/boost/files/boost-binaries/1.55.0-build2/" rel="nofollow">http://sourceforge.net/projects/boost/files/boost-binaries/1.55.0-build2/</a>.</p>
  
  <p>I extracted the binaries to C:\boost_1_55_0 and added the include and linker directories to visual studio project properties.</p>
  
  <p>Include directory: c:\boost_1_55_0
  Link directory: c:\boost_1_55_0\lib64-msvc-12.0</p>
  
  <blockquote>
    <p>error LNK2019: unresolved external symbol "class boost::system::error_category const &amp; __cdecl boost::system::system_category(void)" (?system_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "public: __thiscall boost::system::error_code::error_code(void)"
    \error LNK2019: unresolved external symbol "class boost::system::error_category const &amp; __cdecl boost::system::generic_category(void)" (?generic_category@system@boost@@YAABVerror_category@12@XZ) referenced in function "void __cdecl boost::system::`dynamic initializer for 'errno_ecat''(void)" (??__Eerrno_ecat@system@boost@@YAXXZ)  </p>
  </blockquote>
  
  <p>What am I doing wrong?</p>