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。