spirit_minimal.cpp: In constructor ‘test_grammar<Iterator>::test_grammar()’:
spirit_minimal.cpp:15: error: ‘boost::spirit::qi::double_’ has not been declared
spirit_minimal.cpp:16: error: ‘boost::spirit::qi::_2’ has not been declared
spirit_minimal.cpp:27: error: ‘_3’ was not declared in this scope
spirit_minimal.cpp:27: error: ‘_2’ was not declared in this scope