Boost with C++14

[Sam Varner]

Hi all,

When compiling my own code with gcc 8.2.0 I get "undefined reference to
`boost::system::detail::generic_category_instance'" unless I use
-std=c++11.  Word on the net is that I need to use boost libraries
compiled for C++14. 

'guix edit boost' shows boost and boost-cxx14 packages.  I see that
other packages use the latter with (inputs `((boost ,boost-cxx14))).
How do I link the C++14 variant with my code?  Thanks.