Ruby mysql2 error on migration

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Another tip that might be useful for anyone else coming into this thread:

Using that command given above with IMPORT=1 will trigger this part of your Gemfile:

if ENV["IMPORT"] == "1"
  gem 'mysql2'
  gem 'redcarpet'
  gem 'sqlite3', '~> 1.3.13'
  gem 'ruby-bbcode-to-md', github: 'nlalonde/ruby-bbcode-to-md'
  gem 'reverse_markdown'
  gem 'tiny_tds'
end

I ran into problems with the installation of tiny_tds, and then with another thing it depends on called FreeTDS. After some wasted time on this I realized these are useful only for MS SQL imports, which I won’t be using, so I simply commented out the tiny_tds line in my Gemfile.

(it would be nice to have a comment in front of each of those packages saying what they are used for, if anyone knows)