执行 initdb 时遇到错误：

/usr/local/pgsql/bin/postgres: error while loading shared libraries: libpq.so.5: cannot open shared object file: No such file or directory

发现该库文件存在，尝试更新一下环境变量：

[pg@/usr/local/pgsql]#export PATH=/usr/local/pgsql/bin:$PATH;export LD_LIBRARY_PATH=/usr/local/pgsql/lib:$LD_LIBRARY_PATH

无效，更新 ldconfig 之后正常了。

[pg@/usr/local/pgsql]#echo "/usr/local/pgsql/lib" >> /etc/ld.so.conf
[pg@/usr/local/pgsql]#ldconfig