As a note, the jruby download “.tar.gz” bin, when unpacked…
[~/installs/jruby-1.6.2/bin]# ./jruby -v
./jruby: line 390: /usr/local/jdk/bin/java: No such file or directory
./jruby: line 390: exec: /usr/local/jdk/bin/java: cannot execute: No
such file or directory
Cheers!
-roger-