Wekinator doesn't run after compiling from source

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I installed Wekinator from source as per the instruction in the README: checked 
out the repo, updated using "svn update", then ran ant successfully. However, 
when I run the Wekinator.jar file, I get the following exception:

Exception in thread "main" java.lang.NoClassDefFoundError: joptsimple/OptionSpec
Caused by: java.lang.ClassNotFoundException: joptsimple.OptionSpec
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

I am running Mac OS X 10.7.5 (Lion) on a Macbook Air

Original issue reported on code.google.com by slor...@gmail.com on 10 Oct 2012 at 5:56