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ruby setup.rb CentOS 5 syntax error after running

ruby setup.rb CentOS 5 syntax error after running

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# ruby setup.rb
./lib/rubygems.rb:332: warning: parenthesize argument(s) for future version
./lib/rubygems.rb:514: warning: parenthesize argument(s) for future version
./lib/rubygems.rb:30:in `require’: ./lib/rubygems/deprecate.rb:53: syntax error (SyntaxError)
define_method name do |*args, &block| # TODO: really works on 1.8.7?
^
./lib/rubygems/deprecate.rb:54: syntax error
./lib/rubygems/deprecate.rb:63: syntax error
./lib/rubygems/deprecate.rb:68: syntax error from ./lib/rubygems.rb:30
from setup.rb:27:in `require’
from setup.rb:27
#

The solution to do, you must install the ruby version 1.8.7 or above.
To install ruby version 1.8.7

You can use here.
or you can install 1.9 version from here.

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