#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>

void *function(){
    while(1){
        printf("hello world\n");
    }
}

int main(){
    pthread_t thread_id;
    pthread_create(&thread_id, NULL, function, NULL);
    pthread_join(thread_id, NULL);
    return 0;

}

error:
/tmp/ccUxpahp.o: In function `main':
segment.c:(.text+0x42): undefined reference to `pthread_create'
segment.c:(.text+0x53): undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status