Error Installing Ruby 2.6.7 on MAC Os - How to Resolve

Error installing ruby 2.6.7 on mac os - how to resolve?

Yes, this is a known issue upstream: https://bugs.ruby-lang.org/issues/17777

ruby-build is also tracking this issue: https://github.com/rbenv/ruby-build/issues/1489

The work around is to run the following code, and install ruby 2.6.7 again:

$ export warnflags=-Wno-error=implicit-function-declaration
$ rbenv install 2.6.7

-or-

$ CFLAGS="-Wno-error=implicit-function-declaration" rbenv install 2.6.7

Looks like this can also impact gem installation with native extensions (mysql2 is one of those):

gem install <GEMNAME> -- --with-cflags="-Wno-error=implicit-function-declaration"

Need help installing Ruby 2.7.2 on Mac

You need to install the latest ruby-build

$ brew unlink ruby-build # remove STABLE version
$ brew install --HEAD ruby-build 
$ rbenv install -l | grep '2.7.2'
2.7.2

Only latest stable releases for each Ruby implementation are shown.
Use 'rbenv install --list-all' to show all local versions.

Ruby: BUILD FAILED (macOS 11.2 using ruby-build 20210119) Mac Big Sur

This is not an official solution. I'm sure the rbenv devs are working on an actual solution but this workaround should help others who are setting up their ruby environments on the new M1 chips for Mac.

• Make sure your Terminal is using Rosetta. You can find how to do that using Google.

• Uninstall your current rbenv following these instructions Removing rbenv. Be sure you also remove all the downloaded versions of ruby if you have any (minus the system default) located in /Users/<your user name>/.rbenv/versions/.

• Uninstall the ARM version of Homebrew with: /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall.sh)"

• Install the x86_64 version of Homebrew with: arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

• If you run brew install rbenv should produce output saying "Error: Cannot install in Homebrew on ARM processor in Intel default prefix (/usr/local)!". This is expected.

• You want to tell brew to install the older architecture x86_64 arch -x86_64 brew install rbenv

• Then finally install the version you want using arch -x86_64 rbenv install x.x.x (x = some number i.e. 2.7.2)

From there you just need to remember to tell brew arch -x86_64 when installing other versions of Ruby.

Once an actual fix comes through you'll be able to switch back to the newer architecture and not have to use the arch argument. You also don't have to do this all the time with brew either, just rbenv.

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