当编译安装libevent2进行make verify时，报错：
make[5]: Entering directory `/root/apache/libevent-2.0.22-stable/test' FAIL: test-script.sh
参考：https://github.com/libevent/libevent/issues/38
建议忽略这个错误。
From the looks of it, your resolver isn’t answering the PTR requests for the address 127.0.0.1. Those unit tests expect that the resolver will tell it some answer (ideally “localhost”).
Personally, I would recommend instead that you skip this test or ignore the results if it isn’t passing; it was IMO a mistake to have libevent