gistfile1.c

// src/main.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libspotify/api.h>

#define DEBUG 1

extern const uint8_t g_appkey[];
extern const size_t g_appkey_size;
extern const char *username;
extern const char *password;

int g_logged_in;

void debug(const char *format, ...)
{
    if (!DEBUG)
        return;

    va_list argptr;
    va_start(argptr, format);
    vprintf(format, argptr);
    printf("\n");
}

static void on_login(sp_session *session, sp_error error)
{
    debug("callback: on_login");
    if (error != SP_ERROR_OK) {
        fprintf(stderr, "Error: unable to log in: %s\n", sp_error_message(error));
        exit(1);
    }

    g_logged_in = 1;
}

static void on_main_thread_notified(sp_session *session)
{
    debug("callback: on_main_thread_notified");
}

static int on_music_delivered(sp_session *session, const sp_audioformat *format, const void *frames, int num_frames)
{
    debug("callback: on_music_delivered");
    return 0;
}

static void on_log(sp_session *session, const char *data)
{
    // this method is *very* verbose, so this data should really be written out to a log file
}

static void on_end_of_track(sp_session *session)
{
    debug("callback: on_end_of_track");
}

static sp_session_callbacks session_callbacks = {
    .logged_in = &on_login,
    .notify_main_thread = &on_main_thread_notified,
    .music_delivery = &on_music_delivered,
    .log_message = &on_log,
    .end_of_track = &on_end_of_track
};

static sp_session_config spconfig = {
    .api_version = SPOTIFY_API_VERSION,
    .cache_location = "tmp",
    .settings_location = "tmp",
    .application_key = g_appkey,
    .application_key_size = 0, // set in main()
    .user_agent = "spot",
    .callbacks = &session_callbacks,
    NULL
};

int main(void)
{
    sp_error error;
    sp_session *session;

    // create the spotify session
    spconfig.application_key_size = g_appkey_size;
    error = sp_session_create(&spconfig, &session);
    if (error != SP_ERROR_OK) {
        fprintf(stderr, "Error: unable to create spotify session: %s\n", sp_error_message(error));
        return 1;
    }

    int next_timeout = 0;
    g_logged_in = 0;
    sp_session_login(session, username, password, 0, NULL);
    while (!g_logged_in) {
        usleep(next_timeout * 1000);
        sp_session_process_events(session, &next_timeout);
    }

    printf("success!\n");
    return 0;
}

Hi.... I compile this program after of install libspotify but i still show this error when i compile the complete program:

/home/alex/Escritorio/spot/src/main.o||In function on_login':| main.c|| undefined reference tosp_error_message'|
/home/alex/Escritorio/spot/src/main.o||In function main':| main.c|| undefined reference tosp_session_create'|
main.c|| undefined reference to sp_error_message'| main.c|| undefined reference tosp_session_login'|
main.c|| undefined reference to `sp_session_process_events'|

I would like to know what is the solution at this problem. Thanks....