7stud -- wrote in post #1075511:
>> I've tried to follow instructions in this article:
>>
>>> This post applies to Ubuntu Server 10.10 (Maverick Meerkat)
>>
>> my operating system is mac os x 10.7.4
>
> Some might say...not the best choice.
>
> Leave the system ruby alone, and install the latest version of ruby:
>
> http://www.ruby-lang.org/en/downloads/
>
> Then install rubygems, which is the program that lets you install gems:
>
> http://rubygems.org/
>
> Then try to install a gem

thank you for helping me..I'll try what you said..is there other way to 
solve the problem?

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