Programming

./client: symbol lookup error: ./client: undefined symbol: pthread_create, version GLIBC_2.1

int serverConection(int socket, int number){
    char buffer[SIZE];
    int recvd;
    pthread_t thread;
    DATA tdata;

    recvd = receivFile(socket, number);
    if(recvd != 0) return -1;
    if(send(socket,&number,sizeof(int),0) <= 0)return -1;
    
    while(recv(socket,buffer,SIZE,0)){
        buffer[strlen(buffer)-1] = '\0';
        
        if(strcmp(buffer,"STARTPLAY")){
                    tdata->wait = 0;
                    tdata->period = 45454;
                    tdata->number = number;
                    //pthread_create(&thread,NULL,clientConnect,(void *)auxSocket);    
                    pthread_create(&thread,NULL,showBanner,&tdata);
        }        
    }
    return 0;
}

ldd ./client

undefined reference to `pthread_create'