Can't install mysql2 gem on macOS Sierra

Question

I\'m setting up my development environment in the new macOS Sierra .

First of all, I installed Rbenv, Ruby (2.3.1)

Answer 1

I am here to share my fix, since the other answers didn't work.

For my environment, I need MySQL 5.6 so I had to use:

brew install mysql56 instead of brew install mysql

Bundle installing the mysql2 gem kept failing, until:

brew link mysql56

I also ran afterwards:

mysql.server start

The last step might be unnecessary, but just in case.

Answer 2

First, you should try 2 answer in here If you installed openssl but it still don't work. You should try to o refresh gems reference. A got the same issue and it worked for me.

gem source -r https://rubygems.org/

gem source -a https://rubygems.org/

Answer 3

So I ran into this similar issue and for me it turned out to be a wrong ruby version and incompatible MySQL version. I use ruby 2.3 on most of my projects but inherited a 2.1 project. Changing to rvm to use 2.1 got me a little further.

Then I found this: https://github.com/brianmario/mysql2/issues/603 that said you had to use mysql2 gem version greater than 0.3.17 with MySQL version 5.7

Updated gem to 0.3.17 and it fired right up. Hope this helps someone.

Answer 4

If none of the above works .. like in my case, doing this solved the issue brew install openssl

FYI: i am using MacOS Catalina

Answer 5

Try installing xcode-select --install

Answer 6

I just had the same problem, tried all of the solutions listed above, then commenced to bang my head against they keyboard for a couple of hours.

I then thought to try and install/reinstall the Xcode Command Line Tools:

xcode-select --install

Once I did that the mysql2 gem installed w/ no problems. I hope that does the trick!