Hi Jon,

> Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad
> version number in .class file

It seems that this error occurs if the java runtime version is older
than that of the classes in the JAR file.

> $ java -version
> java version "1.5.0_24"

I have here:

   $ java -version
   java version "1.6.0_18"

Perhaps the easiest is if you build the JAR file yourself (hoping that
our there are no further incompatibilities).

You need, however, a running "bin/picolisp" (which I suspect is no
problem for you ;-)

   $ (cd ersatz; ./mkJar)

This will generate "ersatz/PicoLisp.java" from the two sources "sys.src"
and "fun.src", and pack it into a JAR file

- Alex
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