compile-build.xml:79: java.lang.NoClassDefFoundError: org/apache/xpath/XPathAPI

Hi there,

I am trying to compile Cocoon 2.1.11 in Eclipse (Luna, version 4.4).

I get:
BUILD FAILED
C:\cocoon-2.1.11\tools\targets\compile-build.xml:79: 
java.lang.NoClassDefFoundError: org/apache/xpath/XPathAPI

The problem is this api is supposed to be in xalan-2.7.1.jar and I do 
have xalan-2.7.1.jar on the build path and the jar file is where it is 
specified to be per the Eclipse build path.

I am using jdk1.6.0_21 from Oracle (Java SE).

Any ideas would be appreciated.

Paul