jdbc4 implementation errors building

I just tried building on java 6 and have the following errors ?

/Users/davec/projects/jdbc/pghead/org/postgresql/ds/
PGConnectionPoolDataSource.java:39:
org.postgresql.ds.PGConnectionPoolDataSource is not abstract and does
not override abstract method getQueryObjectGenerator() in
javax.sql.CommonDataSource
[javac] public class PGConnectionPoolDataSource extends
BaseDataSource implements Serializable, ConnectionPoolDataSource
[javac] ^
[javac] /Users/davec/projects/jdbc/pghead/org/postgresql/ds/
PGPoolingDataSource.java:42: org.postgresql.ds.PGPoolingDataSource is
not abstract and does not override abstract method
<T>createQueryObject(java.lang.Class<T>,javax.sql.DataSource) in
javax.sql.DataSource
[javac] public class PGPoolingDataSource
[javac] ^
[javac] /Users/davec/projects/jdbc/pghead/org/postgresql/ds/
PGSimpleDataSource.java:22: org.postgresql.ds.PGSimpleDataSource is
not abstract and does not override abstract method
<T>createQueryObject(java.lang.Class<T>,javax.sql.DataSource) in
javax.sql.DataSource
[javac] public class PGSimpleDataSource
[javac] ^
[javac] /Users/davec/projects/jdbc/pghead/org/postgresql/jdbc4/
Jdbc4Connection.java:21: org.postgresql.jdbc4.Jdbc4Connection is not
abstract and does not override abstract method <T>createQueryObject
(java.lang.Class<T>,java.sql.Connection) in java.sql.Connection
[javac] public class Jdbc4Connection extends
AbstractJdbc4Connection implements java.sql.Connection
[javac] ^
[javac] /Users/davec/projects/jdbc/pghead/org/postgresql/jdbc4/
Jdbc4DatabaseMetaData.java:13:
org.postgresql.jdbc4.Jdbc4DatabaseMetaData is not abstract and does
not override abstract method getFunctionParameters
(java.lang.String,java.lang.String,java.lang.String,java.lang.String)
in java.sql.DatabaseMetaData
[javac] public class Jdbc4DatabaseMetaData extends
AbstractJdbc4DatabaseMetaData implements java.sql.DatabaseMetaData
[javac] ^
[javac] /Users/davec/projects/jdbc/pghead/org/postgresql/xa/
PGXADataSource.java:19: org.postgresql.xa.PGXADataSource is not
abstract and does not override abstract method getQueryObjectGenerator
() in javax.sql.CommonDataSource
[javac] public class PGXADataSource extends BaseDataSource
implements Referenceable, XADataSource

any idea what's going on ?

Dave