adding boost filesystem.hpp doesn't compile - c++

Question

I have the filesystem in my cmake:
find_package(Boost 1.63.0 COMPONENTS program_options system filesystem thread REQUIRED)
When I compile it says Found the following Boost libraries and filesystem is included.
Everything compiles fine. However once I try to include:
#include <boost/filesystem.hpp>
I get the following error. What's happening here?
CMakeFiles\runBasicBrimusTests.dir/objects.a(boost_filesystem_check.cpp.obj):
In function `_static_initialization_and_destruction_0':
C:/Users/b.karjoo/Documents/boost_1_63_0/boost/system/error_code.hpp:221:
undefined reference to `boost::system::generic_category()'
C:/Users/b.karjoo/Documents/boost_1_63_0/boost/system/error_code.hpp:222:
undefined reference to `boost::system::generic_category()'
C:/Users/b.karjoo/Documents/boost_1_63_0/boost/system/error_code.hpp:223:
undefined reference to `boost::system::system_category()'
collect2.exe: error: ld returned 1 exit status
Brimus-Test\basic_tests\CMakeFiles\runBasicBrimusTests.dir\build.make:910:
recipe for target 'Brimus-Test/basic_tests/runBasicBrimusTests.exe'
failed CMakeFiles\Makefile2:293: recipe for target
'Brimus-Test/basic_tests/CMakeFiles/runBasicBrimusTests.dir/all'
failed mingw32-make.exe[3]: ***
[Brimus-Test/basic_tests/runBasicBrimusTests.exe] Error 1
mingw32-make.exe[2]: ***
[Brimus-Test/basic_tests/CMakeFiles/runBasicBrimusTests.dir/all] Error
2 mingw32-make.exe[1]: ***
[Brimus-Test/basic_tests/CMakeFiles/runBasicBrimusTests.dir/rule]
Error 2 CMakeFiles\Makefile2:305: recipe for target
'Brimus-Test/basic_tests/CMakeFiles/runBasicBrimusTests.dir/rule'
failed Makefile:169: recipe for target 'runBasicBrimusTests' failed
mingw32-make.exe: *** [runBasicBrimusTests] Error 2

Answer 1

You should add target link libraries in cmake.
find_package(Boost 1.63.0 COMPONENTS program_options system filesystem thread
REQUIRED)
target_link_libraries(mytarget
${Boost_FILESYSTEM_LIBRARY}
${Boost_SYSTEM_LIBRARY}
)