Clion 2017.2, CMake 3.9.2 and Boost 1.65.1 on Mac OS X Sierra 10.12.6

CMakeLists.txt

If your project uses a Boost library that is not header-only such as 

    #include "boost/filesystem.hpp"

And, you're getting link errors such as:

    Undefined symbols for architecture x86_64:
        ...
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

You need to give your project's CMakeLists.txt the help of CMake's find_package() module.

    find_package(Boost 1.65.1 COMPONENTS filesystem REQUIRED)
       if(Boost_FOUND)
         include_directories(${Boost_INCLUDE_DIRS})
         add_executable(10_file_io ${SOURCE_FILES})
         target_link_libraries(your_project_name ${Boost_LIBRARIES})
       endif()

Note that you're moving the add_executable line into the code block shown above. Replace
filesystem with the name of the Boost library your project requires. Replace
your_project_name with the name of your project.

CLion 2017.2 shipped with CMake 3.8.2 which does not provide CMake find_package() support
for Boost 1.65.1. That's why I'm using an external CMake (version 3.9.2). I installed Boost
and CMake using homebrew.

I spent a lot of time finding this solution after many promising but ultimately useless
web results. This solution appears in ./cmake/3.9.4/share/cmake/Modules/FindBoost.cmake
If you're having Boost library linking issues seek out this file on your own system and
read it. It contains the most up-to-date documentation for find_package().

I hope this helps you.