c – 致命错误：在mac osx 10.10.5下找不到’common.h’文件

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <assert.h>
#include "common.h"

int
main(int argc,char *argv[])
{
  if (argc != 2)
  {
    fprintf(stderr,"usage: cpu <string>n");
    exit(1);
  }
  char *str = argv[1];
  while(1)
  {
    Spin(1);
    printf("%sn",str);
  }
  return 0;
}

当我尝试gcc -o cpu cpu.c -Wall时,

出现错误：致命错误：找不到’common.h’文件,

我尝试从this link下载common.h,并将此文件与cpu.c,但它不起作用,错误消息：

cpu.c:8:1: error: conflicting types for 'main'
main(int argc,char *argv[])
^
./common.h:86:13: note: previous declaration is here
extern int              main(int,char **,char **);
                        ^
cpu.c:18:5: warning: implicit declaration of function 'Spin' is invalid in C99 [-Wimplicit-function-declaration]
    Spin(1);
    ^
1 warning and 1 error generated.

如何修复错误？谢谢.