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Ant problem

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In June everything worked fine. Two months later I came back and updated my Ubuntu machine. Ant doesn't work anymore. Great! What's wrong?

Error message

$ ant compile
Buildfile: /home/jabba/eclipse.2010.etp/etp-0.7/themes2/etp-theme/build.xml
  [taskdef] Could not load definitions from resource ise/antelope/tasks/antlib.xml. It could not be found.

BUILD FAILED
/home/jabba/eclipse.2010.etp/etp-0.7/themes2/etp-theme/build.xml:4: The following error occurred while executing this line:
/home/jabba/eclipse.2010.etp/etp-0.7/themes2/build-common-theme.xml:6: The following error occurred while executing this line:
/home/jabba/eclipse.2010.etp/etp-0.7/build-common-plugin.xml:38: Problem: failed to create task or type antlib:ise.antelope.tasks:stringutil
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.
No types or tasks have been defined in this namespace yet

This appears to be an antlib declaration. 
Action: Check that the implementing library exists in one of:
        -/usr/share/ant/lib
        -/home/jabba/.ant/lib
        -a directory added on the command line with the -lib argument


Total time: 0 seconds

Solution

I added two JAR files to the CLASSPATH

• ~/.ant/lib/ant-contrib.jar (can be found in the Ubuntu repository)
• ~/.ant/lib/antelope_app.jar (downloaded from http://antelope.tigris.org/)

Now it works :)