How do i perform one class classification

WEKA offers some rudimentary support for one-class classfication:

• via the weka.classifiers.functions.LibSVM wrapper classifier (stable 3.6 and developer version). See the LibSVM article for more information.
• via the weka.classifiers.meta.OneClassClassifier meta-classifier (developer version >3.7.0 or snapshot later than 23/7/2009)