64位CentOS5.5在编译php5.3时，提示找不到libmysqlclient，

checking for MING support... no
checking for mSQL support... no
checking for MSSQL support via FreeTDS... no
checking for MySQL support... yes, shared
checking for specified location of the MySQL UNIX socket... no
checking for MySQL UNIX socket location... no
configure: error: Cannot find libmysqlclient under /usr.
Note that the MySQL client library is not bundled anymore!

这是由于搜索路径有误，需在编译时增加一个参数： "--with-libdir=lib64"

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