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/usr/lib/ruby/1.9.1/rbconfig/obsolete.rb is in libruby1.9.1 1.9.3.484-2ubuntu1.

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loc = caller[0]
loc = loc[/\A.*:\d+:/] if loc
loc = "#{loc} " if loc
warn "#{loc}Use RbConfig instead of obsolete and deprecated Config."
Config = RbConfig # compatibility for ruby-1.8.4 and older.