linux C有头文件 但是编译显示没有

Question

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(void)
{
  int i = 1;
  for(i=1;i<2000;i++)
  {
    printf(" Hello World ! i =%d\n",i);
      sleep(1);
  }
      return 0;
}

test.c:(.text.startup+0x32): undefined reference to `sleep'
collect2: error: ld returned 1 exit status
Makefile:9: recipe for target 'test.riscv' failed

Answer 1

你用的哪个编译器