Bug#507436: Source package doesn't build

[Morten Kjeldgaard <mok@bioxray.dk>]

Hi Vincent,

I tried building your jalview source package on my sbuilder, but it  
fails under both unstable and Ubuntu karmic. Here is the the relevant  
part of the log:

BUILD FAILED
/build/mok-jalview_2.4.dfsg-1-amd64-zyP6HR/jalview-2.4.dfsg/build.xml: 
131: Problem: failed to create task or type propertyfile
Cause: the class org.apache.tools.ant.taskdefs.optional.PropertyFile  
was not found.
        This looks like one of Ant's optional components.
Action: Check that the appropriate optional JAR exists in
        -/usr/share/ant/lib
        -/u/mok/.ant/lib
        -a directory added on the command line with the -lib argument

Do not panic, this is a common problem.
The commonest cause is a missing JAR.

This is not a bug; it is a configuration problem



I'm not a Java programmer so I can't really debug it.