This repository has been archived by the owner on Apr 21, 2020. It is now read-only.
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The error message says that ruby >= 1.8.7 is required, but the code explicitly checks for 2.0 and 2.1, disallowing versions 2.2 and above.
https://ruby-doc.org/stdlib-2.3.0/libdoc/rubygems/rdoc/Gem/Version.html would probably be a better way to compare the version numbers, but I don't know if that works with all supported ruby versions.