Spirit X3 : Can't compile any example on Ubuntu 16.04

Can't compile any example on Ubuntu 16.04

$ g++ -std=c++14  main.cpp
In file included from /usr/include/boost/spirit/home/x3/nonterminal.hpp:14:0,
                 from /usr/include/boost/spirit/home/x3.hpp:20,
                 from main.cpp:23:
main.cpp:226:9: error: ‘client::calculator_grammar::parse_rule’ declared as an ‘inline’ variable
         BOOST_SPIRIT_DEFINE(
         ^
main.cpp:226:9: error: expected ‘)’ before ‘rule_’
         BOOST_SPIRIT_DEFINE(
         ^
main.cpp:226:9: error: expected primary-expression before ‘&’ token
         BOOST_SPIRIT_DEFINE(
         ^
main.cpp:226:9: error: ‘first’ was not declared in this scope
         BOOST_SPIRIT_DEFINE(
         ^

this is a spirit::x3 bug?