On Aug 20, 1:51     

> root@alecrim:/usr/local/jruby-1.1.3/bin# ./jgem /usr/local/profligacy*gem
> /usr/bin/env: jruby: No such file or directory

This means that env can't find jruby. You're likely to have problems
with all scripts that you try to run without specifying jruby first. I
recommend putting jruby in your path so that env can find it.