apache-ant編譯中出現「includeantruntime was not set」警告的問題？

最近學習apache-ant運行的時候出現警告： 警告： D:\>ant run Buildfile: D:\build.xml clean:    [delete] Deleting directory D:\build compile:     [mkdir] Created dir: D:\build\classes     [javac] D:\build.xml:126: warning

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