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I'm trying to get Ruby 1.8.7 installed on Plesk 9.5.4. I'm currently running 1.8.6 but gem requires a newer version of Ruby to be installed:

/opt/ruby/bin/gem update --system
Updating RubyGems
Updating rubygems-update
ERROR:  While executing gem ... (Gem::InstallError)
    rubygems-update requires Ruby version >= 1.8.7

An the application I am trying to install requires i18n but that cannot be installed because gem is not up to date:

/opt/ruby/bin/gem install -v=0.4.2 i18n
ERROR:  Error installing i18n:
        i18n requires RubyGems version >= 1.3.5

Any help would be greatly appreciated!

OS: Red Hat Enterprise Linux ES release 4 (Nahant Update 6) Kernel: 2.6.9-67.EL (old, I know..)

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Remove the binary version of Ruby, get the source and install with: ./configure, make, sudo make install. After that, you also can get the RubyGems source code and install with /usr/local/bin/ruby setup.rb.

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Do I need to remove the binary version or can I build from source over the top? – Prisoner Jul 29 '11 at 10:17
You don't. You can backup the binary version mv /usr/bin/ruby /usr/bin/ruby.bak and create a symlink ln -s /usr/local/bin/ruby /usr/bin/ruby. Try this and let me know if it works. – quanta Jul 29 '11 at 10:28
It seems that your older version (1.8.6) was also compiled from source (with --prefix=/opt/ruby). Take a look at RVM. It allows you to install several different versions of Ruby on one computer. – quanta Aug 2 '11 at 10:16
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