NoClassDefFoundError and HADOOPSITEPATH

[Travis Brady]

I had a working install of Pig but I get the following when attempting

$ bin/pig

Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/commons/logging/LogFactory
    at org.apache.pig.Main.<clinit>(Main.java:47)

At revision 639457.

this is on Ubuntu with Java 1.6

also, what has happened to HADOOPSITEPATH?  How do I specify the location of
that file as described here: http://wiki.apache.org/pig/GettingStarted

thank you

-- 
Travis Brady