Java APIs

Hi there,

I wish to suppress warnings such as these in my ant build;

[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.

Going on what the javac ant task allows and what javac itself says to do I think I should have something like;

 <javac srcdir="${srcDir}" destdir="${classDir}">
     <!-- This is only allowed for the srcDir.  Do not do this anywhere else -->
     <compilerarg line="-Xlint:"-unchecked""/>
 </javac>

But this doesn't appear to do what I want. Anyone know exactly how to get these warnings suppressed?