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The full text of the error

The most important line, to my untrained eye, seems to be: ld: warning: The i386 architecture is deprecated for macOS (remove from the Xcode build setting: ARCHS)
But am I really supposed to modify the Xcode build settings?

I am trying $ sudo gem install rails.

My specs:
macOS High Sierra 10.13.6
Xcode version: 10.0 (10A255)
Ruby version: 2.3.7p456
Gem version: 2.7.8

Recommendations I've found so far:
1) Install xcode command line tools. They are installed.
2) bundle config build.nokogiri --use-system-libraries.
/\ I've read that I should not do this.

Any help would be greatly appreciated!

miken32
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shodak
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    Don’t use system Ruby. Install Ruby with RVM, then retry `gem install rails`. – anothermh Dec 18 '18 at 21:14
  • Thank you. Should I remove this question? Does leaving it up help the next person? And is there a reason you didn't post a reply rather than a comment? – shodak Dec 18 '18 at 21:17
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    Because I make the same comment several times a week on nearly identical questions. The answer is always: [don't](https://robots.thoughtbot.com/psa-do-not-use-system-ruby) [use](https://chrisherring.co/posts/why-you-shouldn-t-use-the-system-ruby) [system Ruby](http://billpatrianakos.me/blog/2014/05/15/never-use-system-ruby-ever/), and short/glib responses are better suited to comments. – anothermh Dec 18 '18 at 21:26
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    Going forward, never post your error message by supplying a link to an external website. Post it **here**, in your question. Links die; external sites may be blocked; etc. – anothermh Dec 18 '18 at 21:28
  • @anothermh so do you have a dupe to flag against? – miken32 Dec 19 '18 at 00:31
  • I could find dozens of questions where the gist is "I'm having trouble installing a gem with system Ruby" but I'm not sure it's worth the time to look for even one. The answer is simple: don't use system Ruby. – anothermh Dec 19 '18 at 01:26

2 Answers2

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As @anothermh mentioned, you shouldn't use system ruby. I'd mention further that you don't want to, and shouldn't need to, run sudo to install gems.

Use a ruby version manager such as asdf (my recommended), rvm (probably one of the most popular), or rbenv (also a solid choice).

I'd also recommend, if you haven't done it already, that you grab homebrew because you'll need a few dependencies. Highly recommend at least:

brew install gcc libxml2 readline
Jay Dorsey
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I've tried to bundle install and had issue like this. In my case upgrading rails from 4.2.5. to 4.2.9 fixed error. Maybe it will help someone to not lose time.

Roman Koshynskyi
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    https://stackoverflow.com/questions/53528115/i386-arch-error-installing-old-scrypt-gem-version-with-os-x-mojave - this will work for Mojave – Roman Koshynskyi Dec 27 '19 at 13:17