pycascading build failure

gistfile1.txt

$ ant -Dcascading.release.major=2.0 -Dcascading.release.minor=0
Buildfile: /Users/benl/Projects/python/pycascading/java/build.xml

init:

compile:
     [echo] Cascading version: 2.0.0
    [javac] /Users/benl/Projects/python/pycascading/java/build.xml:64: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Compiling 15 source files to /Users/benl/Projects/python/pycascading/build/classes
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/MetaScheme.java:45: com.twitter.pycascading.MetaScheme is not abstract and does not override abstract method sink(cascading.flow.FlowProcess,cascading.scheme.SinkCall) in cascading.scheme.Scheme
    [javac] public class MetaScheme extends Scheme {
    [javac]        ^
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/MetaScheme.java:107: method does not override or implement a method from a supertype
    [javac]   @Override
    [javac]   ^
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/MetaScheme.java:113: method does not override or implement a method from a supertype
    [javac]   @Override
    [javac]   ^
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/MetaScheme.java:121: cannot find symbol
    [javac] symbol  : method sinkInit(cascading.tap.Tap,org.apache.hadoop.mapred.JobConf)
    [javac] location: class cascading.scheme.Scheme
    [javac]     scheme.sinkInit(tap, conf);
    [javac]           ^
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/MetaScheme.java:119: method does not override or implement a method from a supertype
    [javac]   @Override
    [javac]   ^
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/MetaScheme.java:184: sink(cascading.flow.FlowProcess,cascading.scheme.SinkCall) in cascading.scheme.Scheme cannot be applied to (cascading.tuple.TupleEntry,org.apache.hadoop.mapred.OutputCollector)
    [javac]     scheme.sink(tupleEntry, outputCollector);
    [javac]           ^
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/MetaScheme.java:124: method does not override or implement a method from a supertype
    [javac]   @Override
    [javac]   ^
    [javac] /Users/benl/Projects/python/pycascading/java/src/com/twitter/pycascading/Util.java:130: cascading.flow.FlowConnector is abstract; cannot be instantiated
    [javac]     FlowConnector flowConnector = new FlowConnector(properties);
    [javac]                                   ^
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 8 errors