Hey - great news.

I was able to find a PPM install at http://www.bribes.org/perl/ppm/JavaScript-SpiderMonkey.ppd
Yes - it is possible to compile SpiderMonkey (I have firefox running, etc) however my point is that these things don't work right out of the box.

The ancient incantation:

make
make test
make install
[download]

Is no worky.