安装错误1：
bufferevent_openssl.c:237:2: note: (near initialization for 'methods_bufferevent')
bufferevent_openssl.c:228:19: error: storage size of 'methods_bufferevent' isn't known
static BIO_METHOD methods_bufferevent = {
^~~~~~~~~~~~~~~~~~~
make[2]: *** [Makefile:793: bufferevent_openssl.lo] Error 1
make[2]: Leaving directory '/home/dev/software/xunsearch-full-1.4.14/libevent-2.0.21-stable'
make[1]: *** [Makefile:857: install-recursive] Error 1
make[1]: Leaving directory '/home/dev/software/xunsearch-full-1.4.14/libevent-2.0.21-stable'
make: *** [Makefile:1182: install] Error 2
安装错误2：
checking for correct libevent version... configure: error: libevent 2.0.0 or greater required.
-----
ERROR: failed to configure xunsearch, see 'setup.log' for more detail
分析：
查看系统的openssl的安装版本是否1.1.0+
如果是就是下面原因造成的：
原因在于libevent 2.0.x需要openssl < 1.1.0
常用的几个Linux发行版已经把系统的openssl升级到了1.1.0+
即对应需要libevent 2.1.x+
而libevent 2.1.x改了头文件.. 如果不更换系统openssl版本.
那就可以去手动下载一个 libevent-2.1.11-stable.tar.gz
自己换成bz压缩格式（libevent-2.1.11-stable.tar.bz2）
放进 packages，记得删掉原来的libevent
然后修改 xunsearch-1.4.13/configure
具体步骤：
1.下载libevent-2.1.11-stable.tar.gz；
并将libevent-2.1.11-stable.tar.gz格式换成libevent-2.1.11-stable.tar.bz2；
复制libevent-2.1.11-stable.tar.bz2 至xunsearch-full-1.4.14/packages
#下载
wget https://github.com/libevent/libevent/releases/download/release-2.1.11-stable/libevent-2.1.11-stable.tar.gz
#先解压
tar -zxvf libevent-2.1.11-stable.tar.gz
#压缩成bz2
tar -cjf libevent-2.1.11-stable.tar.bz2 libevent-2.1.11-stable
#复制
cp libevent-2.1.11-stable.tar.bz2 xunsearch-full-1.4.14/packages/
- 进入packages/目录下编辑xunsearch-1.4.14/configure文件
cd xunsearch-full-1.4.14/packages/
#解压xunsearch-1.4.14.tar.bz2
tar -jxvf xunsearch-1.4.14.tar.bz2
#进入xunsearch-1.4.14编辑configure文件
cd xunsearch-1.4.14
vi configure
#做如下修改(line5390)：
#if _EVENT_NUMERIC_VERSION >= 0x02000000
#改为：
#if EVENT__NUMERIC_VERSION >= 0x02000000
#删除旧的xunsearch-1.4.14.tar.bz2，并压缩刚才修改过的文件为：xunsearch-1.4.14.tar.bz2
rm -rf xunsearch-1.4.14.tar.bz2
tar -cjf xunsearch-1.4.14.tar.bz2 xunsearch-1.4.14
#这是重新有了修改过configure的包，xunsearch-1.4.14.tar.bz2
#现在重新安装xunsearch,就可解决刚才的问题
启动xunsearch
./xs-ctl.sh start
启动错误：
WARNING: server[xs-indexd] is running (BIND:127.0.0.1:8383, PID:11417)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by bin/xs-searchd)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by bin/xs-searchd)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by bin/xs-searchd)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `CXXABI_1.3.8' not found (required by /home/dev/local/libs/xunsearch/lib/libxapian.so.30)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.18' not found (required by /home/dev/local/libs/xunsearch/lib/libxapian.so.30)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /home/dev/local/libs/xunsearch/lib/libxapian.so.30)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `CXXABI_1.3.5' not found (required by /home/dev/local/libs/xunsearch/lib/libxapian.so.30)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /home/dev/local/libs/xunsearch/lib/libxapian.so.30)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.23' not found (required by /home/dev/local/libs/xunsearch/lib/libxapian.so.30)
bin/xs-searchd: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /home/dev/local/libs/xunsearch/lib/libxapian.so.30)
可能原因是因为升级了Gcc的原因。
解决：
find / -name libstdc*
...
/usr/lib64/libstdc++.so.6.0.13
/usr/lib64/libstdc++.so.6
...
/usr/local/lib64/libstdc++.so.6.0.27
...
/usr/local/lib64/libstdc++.so
...
/usr/local/lib64/libstdc++.so.6
##复制/usr/local/lib64/libstdc++.so.6.0.27至目录/usr/lib64/下
cp /usr/local/lib64/libstdc++.so.6.0.27 /usr/lib64/
cd /usr/lib64
ln -s libstdc++.so.6.0.27 libstdc++.so.6
#既可解决
