use Inline C => Config => LIBS => '-lparser';

##</code><code>##

use Inline C => Config => LIBS => '-lfoo';

##</code><code>##

use Inline C => Config => LIBS => '-L/path/to/lib -lfoo';

##</code><code>##

use Inline C => Config =>
    BUILD_NOISY => 1,
    LIBS => '-L/path/to/lib -lfoo';

##</code><code>##

use Inline C => <<END_C;
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Wild guess follows:
int parser (char * url, char * page, char * pool, int lenx2) {
       // C code that does whatever
       // it is that parser()does.
}

char* MyParser(char *url, char* page)
{
        char *pool;
        int len;
        int ret;

        len = strlen(page);

//      page = (char*)malloc(len);

        pool = (char*)malloc(2*len+1);

        // parsing page
        ret = parser(url, page, pool, 2*len+1);


        if(ret > 0)
                return pool;
        free(pool);
}

END_C