执行./configure命令出现如下奇怪的错误，百思不得姐：

./configure命令的日志文件为config.log，发生错误时，该文件的内容：

This file contains any messages produced by compilers while
running configure, to aid debugging if configure makes a mistake.configure:538: checking for gcc
configure:615: checking whether the C compiler (gcc  ) works
configure:629: gcc -o conftest    conftest.c  1>&5
configure:626:1: error: return type defaults to 'int' [-Wimplicit-int]626 | main(){return(0);}| ^~~~
configure: failed program was:
#line 625 "configure"
#include "confdefs.h"
main(){return(0);}

继续查看configure文件：

在main()函数前加"int"，执行./configure，ok！搞定！

别急！还有，学到了什么？linux上的开发错误，除了一些常见的，很多错误需要自己找原因，你就是一个完整的OS！