Ruby: Build Failed (Macos 11.2 Using Ruby-Build 20210119) MAC Big Sur

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.

Ruby installation (2.2.2) fails in macOS Big Sur

EDIT

It looks like OP edited the error in the original message so the below answer is no longer relevant. Leaving it here for posterity.

Updated Answer

Based on discussion in a couple of Github issues on the rbenv repo,

• https://github.com/rbenv/ruby-build/issues/1480
• https://github.com/rbenv/ruby-build/issues/1489

it sounds like Apple changed the default CFLAGS as part of xcode 12, which makes some of the native extension installations go haywire. It sounds like the solution proposed in those issues is

CFLAGS="-Wno-error=implicit-function-declaration" rbenv install 2.2.2

Original answer

The error states it failed due to issues with extensions

The Ruby readline extension was not compiled.
The Ruby zlib extension was not compiled.
ERROR: Ruby install aborted due to missing extensions

so I would suggest trying to install those extensions manually first, then retrying the ruby install.

With brew:

brew install readline
brew install zlib

There are some issues on ruby-build's github that might help as well:

• https://github.com/rbenv/ruby-build/issues/1076
• https://github.com/rbenv/ruby-build/issues/832#issuecomment-160906530

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