Log Message:
(ham/gnuradio-core) Add GCC_REQD = 8

[ 12%] Building CXX object \ 
gnuradio-runtime/lib/CMakeFiles/gnuradio-runtime.dir/basic_block.cc.o
In file included from /usr/pkg/include/boost/dll/runtime_symbol_info.hpp:11:0,
                 from \ 
/tmp/ham/gnuradio-core/work/gnuradio-3.10.0.0/build/gnuradio-runtime/lib/constan \ 
ts.cc:16:
/usr/pkg/include/boost/dll/config.hpp:47:22: error: 'filesystem' is not a \ 
namespace-name
 using namespace std::filesystem;
                      ^~~~~~~~~~
/usr/pkg/include/boost/dll/config.hpp:47:32: error: expected namespace-name \ 
before ';' token
 using namespace std::filesystem;
                                ^