OKAY this is very helpful! Thanks to Drew's point, I went out and attempted to install version 0.3+ of v8js.
Unfortunately, using pecl install on Ubuntu to install anything later than 0.1.3 results in an error message saying a newer version of libv8 needs to be installed. I struggled for a bit until I came upon this post:
Now the v8js error has gone away. Just a warning.... the step "make native library=shared" took about 45 minutes for my Ubuntu server to compile.
EDIT: Don't forget "sudo php5enmod v8js"