目录项事实上就是通过元数据描述的；实际上，如果在这样的应用程序中有一个搜索框，那么它通常只搜索元数据。
Catalog items are essentially described only by metadata; in fact, if there's a search box in such an application, it often only searches metadata.
真正错误在于，编译器需要一个单独的标记来告诉它 /usr/X11R6/lib 需要在搜索目录列表中出现，这样在运行时才可以找到动态链接库。
What really went wrong is that the compiler needed a separate flag to tell it that /usr/X11R6/lib needed to be in the list of directories to search at runtime for dynamically-linked libraries.
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