[Rubycocoa-talk] multiple ruby libraries leads to segmentation fault

[Stephyn B. <ste...@co...>]

I apologize if this has been covered. I tried to go through the  
archives up until the release of Leopard but I didn't see anything  
that that specifically addressed this issue.

I was running a simple code example from a book:

require 'osx/cocoa'

include OSX

class AppDelegate < NSObject
	def applicationDidFinishLaunching( aNotification)
		puts "#{aNotification.name} makes me say: Hello, world!"
	end
end
NSApplication.sharedApplication
NSApp.setDelegate( AppDelegate.alloc.init)
NSApp.run

and because I've quite successfully run RubyCocoa apps, I was quite  
surprised to see the following error:

$ ruby basic.rb
2008-06-13 19:24:05.049 ruby[38469:10b] WARNING: multiple  
libruby.dylib found: '/usr/local/lib/libruby.dylib' and '/System/ 
Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/libruby.1.dylib'
2008-06-13 19:24:05.055 ruby[38469:10b]  
RBCocoaInstallRubyThreadSchedulerHooks: warning:  
rb_set_cocoa_thread_hooks is linked from a different library (/System/ 
Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/libruby. 
1.dylib) than ruby_init (/usr/local/lib/libruby.dylib)
Segmentation fault
$

now if I run using the ruby that exists in /System/Library/Frameworks/ 
Ruby.framework/Versions/1.8/usr/bin/, I get:

$ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby  
basic.rb
NSApplicationDidFinishLaunchingNotification makes me say: Hello, world!

which is the expected behavior.

The basic question is, is there a way to fix this without running two  
versions of ruby? And by fix, this means having all of my installed  
gems accessible, being able to do just regular command line ruby, is  
the /System/Library/.../bin/ruby free of the problem that the version  
in Tiger had (which I even forget what it was...something about mySQL  
comes to mind)? Is there any reason to keep up two parallel  
installations of ruby 1.8.6 and what are the ramifications of picking  
one installation over the other?

Or is the result of not having compiled with the shared library  
option? (Sorry, I came to programming in the Java Age, if configure,  
make, make install doesn't do it, I'm completely lost).

Any help would be appreciated.