How do you compare 2 strings in Yacc/Bison?

Question

We are asked to use FLEX software and gotta write the code in C. First string is Collected from a text file, this is how I did it in LEX:

%option noyywrap yylineno
%{
    #define YYSTYPE char *
    #include "y.tab.h"
%}
%%
[ \t\n]+ {}
"NAZIV" {return _NAZIV;}
"GODINA" {return _GODINA;}
"TIP" {return _TIP;}
"ECTS" {return _ECTS;}
":" {return _DVOTACKA;}
";" {return _SEMICOLON;}
[A-Za-z]+  {yylval=strdup(yytext); return _VRIJEDNOST;}
[0-9]+   {yylval =atoi(yytext); return _BROJ_BODOVA;}

So I need to collect a whatever string [A-Za-z]+ in second to last line. Now in Yacc I need to increase a counter if the text file says "obavezni" at that spot. I did it like so when encountering the spot in text file:

: _TIP _DVOTACKA _VRIJEDNOST _SEMICOLON
{result=strcmp($3,string);if(result==0) prvi_uslov=1; }
;

string from up there is char string[]="obavezni"; This way I get a bunch of warnings about not being able to compare const * char and *char and that one of the arguments is of type YYSTYPE. I started doing Yacc/Bison yesterday and I have no idea what this means, I just need a simple way to compare a collected value from text file to an existing string, and if they are same counter goes up. That's all. Thanks to all kind souls willing to help