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http://rpm.pbone.net/index.php3/stat/4/idpl/8165970/com/gant-1.3.0-10.1.noarch.rpm.html reports that Gant 1.3.0 has been packaged for OpenSuSE. It depends on Groovy 1.5.6 being installed. Also more recent versions of Gant are available through the OpenSUSE build service . They depend on Groovy >= 1.5.6 being installed as an RPM.
Ealier distributions are available at http://dist.codehaus.org/gant/distributions as are snapshots of the next release, if available.
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