ruby,

Solution: gem eventmachine fatal error: 'openssl/ssl.h' file not found

Nov 05, 2021 · 1 min read · Post a comment
Solution: gem eventmachine fatal error: 'openssl/ssl.h' file not found

I’ll be doing a solutions to common issues in Ruby dev environment series, so here’s the link to the first post:

Today’s solution will be related to the gem eventmachine fatal error: 'openssl/ssl.h' file not found error.

Prerequisites

  • Ruby environment

Solution

Step 1. First, make sure that the openssl package is removed.

$ brew uninstall openssl

Step 2. Next, remove all unused dependencies.

$ brew autoremove

Step 3. Reinstall openssl.

$ brew install openssl

Step 4. Install gem eventmachine using bundle.

$ bundle install

Note: bundle install is the preferred way, since Bundler (bundle) manages a gem set linked to an application using Gemfile. It introduces a gem version consistency while deploying a ruby app on multiple machines or environments.
Alternatively, you could try running gem install eventmachine -v ‘1.2.7’.

Conclusion

The issue happens mainly because Apple is removing the openssl package during software updates. Feel free to leave a comment below and if you find this tutorial useful, follow our official channel on telegram.