Erjang on OSX 10.6.x

A few obstacles I was having when trying to setup Erjang on OSX 10.6.x
1. Perl version
Erjang requires perl 5.10.0, and the default perl on the system is 5.8.x.
Perl 5.10.x is installed on the system however, so all I have to do is to modify build.xml,
replacing executable="perl" with executable="perl5.10.0"
2. Erlang environment vars
To make it easy, I add a soft link /sw that points to /opt/local

Then I can just do

./erl.sh -pa ./src/main/erl -noshell -s ring main