Problem porting pigunit tests to linux client.

My tests were developed using eclipse and a private environment setup on my
Mac. All went well. The goal is to run these tests on a shared client and
offload the test input onto the cluster, and I am working to piece together
the 'project' I have on my Mac. It has been tedious but going okay locating
and pointing to jars needed. I got the pigunit test to compile and I
thought I was on the home stretch but hit the following error which has me
stumped:

java.lang.NoSuchMethodError:
org.apache.pig.tools.grunt.GruntParser.<init>(Ljava/io/Reader;Lorg/apache/pig/PigServer;)V

at org.apache.pig.pigunit.pig.GruntParser.<init>(GruntParser.java:53)

.....

I've googled a lot and most of the hits are about things I am not using -
Hive, avro , json etc. I am wondering about how to determine the
compatibility of the jar files. I have used only jars found on the client
where pig jobs and grunt cmd line works fine to the cluster. I do question
the lineage of the pigunit jar.

GruntParser's jar is in my pigunit jar and in the CLASSPATH. I had a look
at GruntParser and it imports nothing except some stand java stuff io/util
libraries.

I am not sure what you need to know but am hoping this error rings a bell
with someone.

Thanks