any way include a fileset in a classpath conditionally?

[Nolan Ring]

Hi,

The following is the classpath for my javac task.  The problem I'm having is
that the nightlyBuildDir directory, which is defined in a global.properties
file, may or may not exist.  If it does exist, I want its contents to be
included in the classpath; if it doesn't exist I want it to be skipped.
Right now, if ${nightlyBuildDir} doesn't exist my build fails.

Is there some way to conditionally set include fileset based on whether or
not ${nightlyBuildDir} exists?  I thought, at first, that <available> might
work, but don't want to run the entire target conditionally - just set this
piece of the classpath. 

        <classpath>
            <pathelement path="${classpath}"/>
            <pathelement path="${classesDir}"/>
            <fileset dir="${distDir}">
                <include name="**/*.jar"/>
                <include name="**/*.zip"/>
                <exclude name="${jarName}"/>
            </fileset>
            <fileset dir="${nightlyBuildDir}">
                <include name="**/*.jar" />
                <include name="**/*.zip" />
                <exclude name="${jarName}" />
            </fileset>
            <fileset dir="${libDir}">
                <include name="**/*.jar"/>
            </fileset>
         </classpath>

Thanks much.

Nolan Ring

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