Building ruby with source rpms on ppc

folks
I am trying to build ruby 1.8.4 on ppc architecture for fedora using src
rpms.
The problem i am getting is it fails to create ri directory

/devel3/chroot/errata41-aj/BUILD/ruby-1.8.4/ruby-1.8.4/lib/yaml.rb:9:in
`require': no such file to load -- stringio (LoadError)

any solutions

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