如果在构建期间出现一个错误，并且最终的输出文件并没有生成，那么用户必须通过某种方式来找到错误。

If an error occurs during the build, and the final output files are not produced, the user must have a way to discover what went wrong.

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清单6显示了域名服务器(DNS)查找某个主机名期间的输出。

Listing 6 shows the output during a Domain name Server (DNS) lookup for a hostname.

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例如，清单5显示了在NFS数据交换期间的输出。

For example, Listing 5 shows the output during an NFS data exchange.

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