Here's a patch[1] I applied to RubyGems to get it working with YARV.  I think the
problem is RubyGems/1.9 incompatibility.  I need to dig around in Gem::TarReader::Entry
some more.

_why

[1] http://whytheluckystiff.net/ruby/rubygems-0.8.99-yarv.patch

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