features.h 파일은 무슨 패키지를 깔아야 되나요?

flex 예제 중 c++ 예제를 해볼려고 하는데 컴파일이 안되는군요..;;

$ flex -+ test.l

 // An example of using the flex C++ scanner class.

%{
int mylineno = 0;
%}

string  \"[^\n"]+\"

ws      [ \t]+

alpha   [A-Za-z]
dig     [0-9]
name    ({alpha}|{dig}|\$)({alpha}|{dig}|[_.\-/$])*
num1    [-+]?{dig}+\.?([eE][-+]?{dig}+)?
num2    [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)?
number  {num1}|{num2}

%%

{ws}    /* skip blanks and tabs */

"/*"    {
        int c;

        while((c = yyinput()) != 0)
            {
            if(c == '\n')
                ++mylineno;

            else if(c == '*')
                {
                if((c = yyinput()) == '/')
                    break;
                else
                    unput(c);
                }
            }
        }

{number}  cout << "number " << YYText() << '\n';

\n        mylineno++;

{name}    cout << "name " << YYText() << '\n';

{string}  cout << "string " << YYText() << '\n';

%%

Version 2.5               December 1994                        44

int main( int /* argc */, char** /* argv */ )
    {
    FlexLexer* lexer = new yyFlexLexer;
    while(lexer->yylex() != 0)
        ;
    return 0;
    }

$ g++ lex.yy.cc

In file included from /usr/include/c++/4.0.2/i486-linux-gnu/bits/c++config.h:35,                 from /usr/include/c++/4.0.2/iostream:43,
                 from lex.yy.cc:83:
/usr/include/c++/4.0.2/i486-linux-gnu/bits/os_defines.h:39:22: error: features.h: 그런 파일이나 디렉토리가 없음