$ ant
Buildfile: build.xml
  [taskdef] Could not load definitions from resource clovertasks. It could not be found.

init:
     [echo] Build Hibernate Annotations-3.1beta7 (2006-01-08 12:16:30)
    [mkdir] Created dir: /usr/share/java/hibernate-annotations-3.1beta7/build/classes
     [copy] Copying 2 files to /usr/share/java/hibernate-annotations-3.1beta7/build

compile:
    [javac] Compiling 127 source files to /usr/share/java/hibernate-annotations-3.1beta7/build/classes
    [javac] /usr/share/java/hibernate-annotations-3.1beta7/src/org/hibernate/validator/ClassValidator.java:34: cannot find symbol
    [javac] symbol  : class IdentitySet
    [javac] location: package org.hibernate.util
    [javac] import org.hibernate.util.IdentitySet;
    [javac]                           ^
    [javac] /usr/share/java/hibernate-annotations-3.1beta7/src/org/hibernate/cfg/AnnotationBinder.java:736: cannot find symbol
    [javac] symbol  : constructor FilterDefinition(java.lang.String,java.lang.String,java.util.Map<java.lang.String,org.hibernate.type.Type>)
    [javac] location: class org.hibernate.engine.FilterDefinition
    [javac]             FilterDefinition def = new FilterDefinition( defAnn.name(), defAnn.defaultCondition(), params );
    [javac]                                        ^
    [javac] /usr/share/java/hibernate-annotations-3.1beta7/src/org/hibernate/validator/ClassValidator.java:216: cannot find symbol
    [javac] symbol  : class IdentitySet
    [javac] location: class org.hibernate.validator.ClassValidator<T>
    [javac]             return this.getInvalidValues( bean, new IdentitySet() );
    [javac]                                                         ^
    [javac] 3 errors

BUILD FAILED
/usr/share/java/hibernate-annotations-3.1beta7/build.xml:40: Compile failed; see the compiler error output for details.