Ruby Error: echo executable host ruby is required

This error will occur if you do not have a base ruby installation. This error was experienced when trying to install Ruby 1.9.2-p290. This was solved by:

1) Downloading an older version of ruby, such as
2) Compile, and install it. Make sure the ruby executable are in the path.
3) Proceed with compiling the Ruby 1.9.2-p290 source.

A base ruby installation was required to upgrade to the newer version.

[root@computer ruby-1.9.2-p290]# ruby --version
ruby 1.9.2p290 (2011-07-09) [i686-linux]

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