Yes, building a new JAR made it. Thanks!
> 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