Why I can't use pthread_creat ?

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C

Linux

#include <stdio.h> 
#include <unistd.h>
#include <pthread.h>

void* thread_main(void *argument){

        int i;
        int cnt = *((int*)argument);

        for(i = 0; i < cnt; i++){
                sleep(1);
                puts("working....");
        }
        return NULL;
}


int main(){

        pthread_t t_id;
        int thread_param = 5;

        if(pthread_creat(&t_id, NULL, thread_main, (void*)&thread_param) != 0){
                puts("pthread_creat() error ");
                return -1;
        };

        sleep(10);
        puts("main end");
        return 0;
}

>> gcc -o thread thread.c -lpthread
thread.c: In function ‘main’:
thread.c:23:5: warning: implicit declaration of function ‘pthread_creat’ [-Wimplicit-function-declaration]
  if(pthread_creat(&t_id, NULL, thread_main, (void*)&thread_param) != 0){
     ^
/tmp/ccERlxNy.o: In function `main':
thread.c:(.text+0x81): undefined reference to `pthread_creat'
collect2: error: ld returned 1 exit status

It's test for basic working thread. but I can't compile this. what's the problem?

OS is linux ubuntu 64bit

What I have tried:

i try to link use gcc -l option, but it was not working.

thread.c:(.text+0x81): undefined reference to `pthread_creat' in google search, every answer are same, just add -lpthread . what the problem

header files

#include <stdio.h> 
#include <unistd.h>
#include <pthread.h></pthread.h></unistd.h></stdio.h>