ant task equivalent to -D<property>=<value>?

I am attempting to pass a system property to one of my custom modules.  This
works as expected when running checkstyle from the command with the usage
provided on this page:
http://checkstyle.sourceforge.net/cmdline.html
specifically using the java argument "-Dmyvariable=mystring"


However, I have been unable to find an ant task equivalent to passing in
these system properties:


Things that I have tried (none of which worked):

1) adding "-Dmyvariable=mystring" as an argument to the ant call

2) http://checkstyle.sourceforge.net/anttask.html
Unless I am misunderstanding, the URL above suggests that adding
<property key="myvariable" value="mystring"/> under <cs:checkstyle>
should have the same effect?

3) <sysproperty>?  Though none of the checkstyle xml elements recognize it,
so I am unsure where it could be added.


Any help is appreciated,
Michael



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