# Irb Failing

**URL:** <https://www.ruby-forum.com/t/irb-failing/115039>\
**Category:** Ruby\
**Created:** [September 20, 2007, 1:13am UTC](https://www.ruby-forum.com/t/irb-failing/115039 "2007-09-20T01:13:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ari\_B](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a698b9/32.png) [@Ari\_B](https://www.ruby-forum.com/u/Ari_B)\
**Post date:** [September 20, 2007, 1:13am UTC](https://www.ruby-forum.com/t/irb-failing/115039/1 "2007-09-20T01:13:40Z")

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Hey everyone  
So let me begin my story…  
I wanted to be awesome in my own mind, so I decided to learn to  
program ruby. I installed ruby from source on my mac into /usr/local/  
bin and everything went dandy. IRB, erb, rdoc, ri, the whole shebang #!!

Then I decided it was time for me to upgrade.  
First, I tried installing ruby from darwinports… No luck…  
So then I tried installing it from scratch again, this time in /opt.  
Ruby works, erb works, RDoc works, everything EXCEPT irb works.

Here is my error:

[Snow-iMac: ~] ari$ irb  
dyld: NSLinkModule() error  
dyld: Symbol not found: \_rl\_filename\_completion\_function  
Referenced from: /opt/ruby-1.8.6/lib/ruby/1.8/powerpc-darwin8.10.0/  
readline.bundle  
Expected in: flat namespace

Trace/BPT trap

I feel like someone should’ve seen this error before! Turns out Ryan  
Davis, one of my many Ruby gods, has. He had a method which felt sort  
of hacked together. I haven’t tried it yet, but before I do…

Does anyone have any advice on how to solve or fix this?

Ari  
-------------------------------------------|  
Nietzsche is my copilot