# Rails on Mac OS X Leopard

**URL:** <https://www.ruby-forum.com/t/rails-on-mac-os-x-leopard/132091>\
**Category:** Rails\
**Created:** [March 16, 2008, 8:02pm UTC](https://www.ruby-forum.com/t/rails-on-mac-os-x-leopard/132091 "2008-03-16T20:02:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nahabed](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/b77776/32.png) [@nahabed](https://www.ruby-forum.com/u/nahabed)\
**Post date:** [March 16, 2008, 8:02pm UTC](https://www.ruby-forum.com/t/rails-on-mac-os-x-leopard/132091/1 "2008-03-16T20:02:21Z")

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A few days ago I got a new Macbook Pro (yippie!). Until now, I was  
using Instant Rails on Windows. I am now trying to get my rails  
projects to run on the MBP having copied them from Windows.

From the terminal window, I can see that Rails and Ruby are installed  
as advertised (–version works). For now, I am happy wth Ruby 1.8.6  
and Rails 1.2.6 that are on there. HOWEVER, when I try “ruby script/  
server” or “ruby script/console” I keep getting the following error.

Cannot find gem for Rails ~\>1.2.3.0:  
Install the missing gem with ‘gem install -v=1.2.3 rails’, or  
change environment.rb to define RAILS\_GEM\_VERSION with your  
desired version.

What am I missing? Isn’t all the “basic” stuff preinstalled out of the  
box? The project I am trying to run is very simple - no fancy gems or  
anything. It was also built using 1.8.6

I read this [http://developer.apple.com/tools/developonrailsleopard.html](http://developer.apple.com/tools/developonrailsleopard.html)  
but its trying to get me to update and I’d like to stick to 1.8.6 and  
1.2.6 since some of my other projects are based on that.

Thanks, Roupen N.

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<div class="post-metadata">

**Author:** ![nahabed](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/b77776/32.png) [@nahabed](https://www.ruby-forum.com/u/nahabed)\
**Post date:** [March 16, 2008, 8:08pm UTC](https://www.ruby-forum.com/t/rails-on-mac-os-x-leopard/132091/2 "2008-03-16T20:08:32Z")

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On 16 Mar 2008, at 20:01, nahabed wrote:

> Install the missing gem with ‘gem install -v=1.2.3 rails’, or  
> 1.2.6 since some of my other projects are based on that.  
> Your environment.rb states Rails 1.2.3 as the version to look for,  
> just change it to 1.2.6 and you’re done.

Best regards

Peter De Berdt