zunda
vendor/cacheにmimemagic-0.3.5.gemを置いておけばなんとかなりそうわね
$ git clone https://github.com/tootsuite/mastodon.git$ cd mastodon$ git checkout v3.3.0$ mkdir -p vendor/cache$ cp ~/mimemagic-0.3.5.gem vendor/cache/$ bundle install --path=vendor/bundle :Installing mimemagic 0.3.5 :
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