Installation failure on macOS Mojave

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[avdv]

You are probably missing the XCode command line tools.

See here: http://www.ammauro.com/posts/mac-os-x-development-environment-with-ruby/#installing-xcode-command-line-tools

[avdv]

Also, just have a look into the /Library/Ruby/Gems/2.3.0/extensions/universal-darwin-18/2.3.0/clocale-0.0.4/mkmf.log file.

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[avdv]

Also, what about my Xubuntu vm? Why wouldn't it install there?

Probably also because of some missing development tools. Make sure you have a C ompiler (e.g. gcc) and make installed.

By the way, do you need to install via package or can you just use xcode-select --install?

I have no idea.

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[avdv]

It seems your ruby installation is somehow broken.

You might try any suggestion here: https://stackoverflow.com/questions/26434642/yosemite-upgrade-broke-ruby-h?noredirect=1&lq=1

But, since Ruby 2.3.x is rather old, I would preferably install a new version via homebrew.

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