工作中使用cpan来安装 DBD::mysql 模块，由于是编译的SQL版本，已在/etc/profile 中修改：export PATH=/usr/local/mysql/bin:$PATH，担心找不到mysql lib文件。
报错：
# Tried to use 'DBD::mysql'.
# Error: Can't load '/root/.cpan/build/DBD-mysql-4.022/blib/arch/auto/DBD/mysql/mysql.so' for module DBD::mysql: libmysqlclient.so.16: 无法打开共享对象文件: 没有那个文件或目录 at /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/DynaLoader.pm line 230.
# at (eval 6) line 2
# Compilation failed in require at (eval 6) line 2.
# BEGIN failed--compilation aborted at t/00base.t line 21.
FAILED--Further testing stopped: Unable to load DBD::mysql
make: *** [test_dynamic] 错误 9
/usr/bin/make test -- NOT OK
Running make install
make test had returned bad status, won't install without force
[root@localhost dbdata_backup]# perl -MCPAN -e shell
Terminal does not support AddHistory.
cpan shell -- CPAN exploration and modules installation (v1.7602)
ReadLine support available (try 'install Bundle::CPAN')
解决：
安装成功。
手工安装DBD的技巧：
注意mysql的环境变量，若没有则用 添加/usr/local/mysql/bin到环境变量PATH中
PATH=/usr/local/mysql/bin:$PATH;
export PATH (mysql的安装路径根据实际情况填写)