gistfile1.rb

def require(lib)
    @paths ||= []
    return false if @paths.include?(lib)
    $:.each { |path|
        ['','.rb','.so'].each { |ext|
            l = "#{path}/#{lib}#{ext}"
            if File.exist?(l)
                @paths << l
                load l
                return true
            end
        }
    }
    raise LoadError, "Couldn't load #{lib}!"
end