Ant问题：warning: 'includeantruntime' was not set

E:\workspace\webAdmin>ant compile
Buildfile: E:\workspace\webAdmin\build.xml

init:

compile:
[javac] E:\workspace\webAdmin\build.xml:28: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repe
atable builds
[javac] Compiling 1 source file to E:\workspace\webAdmin\build\WEB-INF\classes

BUILD SUCCESSFUL
Total time: 1 second

解决：

<javac srcdir="${build.src}" destdir="${build.dest}">

改为

<javac srcdir="${build.src}" destdir="${build.dest}" includeantruntime="on"/>

答案参考于网络。谢谢同仁。