[cURL] - undefined reference to `curl_easy_... - 6 errors

#include <stdio.h>
#include <curl/curl.h>

int main( void )
{
   
    CURL * curl;
    CURLcode res;
   
    curl = curl_easy_init();
   
    if( curl )
    {
        curl_easy_setopt( curl, CURLOPT_URL, "http://localhost/login.php" );
        curl_easy_setopt( curl, CURLOPT_POST, 1 );
        curl_easy_setopt( curl, CURLOPT_POSTFIELDS, "login=levik&password=tajne" );
        res = curl_easy_perform( curl );
        curl_easy_cleanup( curl );
    }
}