Installing Ruby with Homebrew

Installing Ruby with Homebrew

in ~/.bash_profile add the following line

export PATH=/usr/local/Cellar/ruby/1.9.3-p194/bin:$PATH

When you're done, close your terminal and re-open it. You should be fine.

Alternatively, you can execute the follwing in each open shell instead of closing/re-opening:

source ~/.bash_profile

Note:
I highly recommend installing ruby via rvm or rbenv so you can manage multiple ruby versions and use gemsets.

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.

How to use the Homebrew's Ruby package instead of the Ruby package that comes with MacOS?

Figured out my mistake.

export PATH="/usr/local/Cellar/ruby/2.6.1/bin/ruby:$PATH"

Should have been

export PATH="/usr/local/Cellar/ruby/2.6.1/bin:$PATH"

then just run

source ~/.bash_profile

and confirm with ruby -v or type -a ruby

How to update Ruby with Homebrew?

brew upgrade ruby

Should pull latest version of the package and install it.

brew update updates brew itself, not packages (formulas they call it)

Install ruby with asdf on MacOS via Homebrew

I am facing same situation. It seems to be fixed soon.

https://github.com/asdf-vm/asdf-ruby/issues/239

Edit ~/.asdf/plugins/ruby/bin/install and apply this patch then the problem is fixed for me.

-  if [[ -n "$matching_version" ]]; then
+  if [[ -z "$matching_version" ]]; then

How can I switch to ruby 1.9.3 installed using Homebrew?

I suggest you take a look at rvm.
You can then set it as default with rvm use 1.9.3 --default

But if you are happy with your homebrew install.

Then just change the precedence of directories in the PATH

Here is my /etc/paths

# homebrews should always take precedence
/usr/local/bin

# the default stack
/usr/bin
/bin
/usr/sbin
/sbin

This is important generally for homebrew, else the system version of git, ruby, pg_admin,... will all be used instead of the brew version.

if you say which -a ruby you'll see all the installed rubies, and the precedence in the PATH

eg.

$ which -a ruby
/Users/matthew/.rvm/rubies/ruby-1.9.3-p0/bin/ruby
/Users/matthew/.rvm/bin/ruby
/usr/bin/ruby

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UPDATE: I now don't think you should change /etc/paths

Instead you need to check which of .profile, .bashrc, or .bash_login is being loaded in your shell, and just add /usr/local/bin to your path.

For me, I only have a .profile. You can create that file if none of those files already exist in your home directory.

# homebrews should always take precedence
export PATH=/usr/local/bin:$PATH

Install older Ruby versions on a M1 MacBook?

In order to make installing of Ruby versions 2.6.x or 2.7.x successful on M1 MacBook using either rbenv or asdf (asdf is used in this example) follow these steps:

Upgrade to the latest version of rbenv or asdf-ruby plugin using your prefered installation method. In my case it's asdf-ruby installed over homebrew:

brew upgrade asdf
asdf plugin update ruby

Reinstall the current versions of openssl, readline and ruby-build in order to have the latest versions and configs:

brew uninstall --ignore-dependencies readline
brew uninstall --ignore-dependencies openssl
brew uninstall --ignore-dependencies ruby-build
rm -rf /opt/homebrew/etc/openssl@1.1
brew install -s readline
brew install -s openssl
brew install -s ruby-build

In your shell config .bashrc or .zshrc add the following ENV variables:

export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)"
export LDFLAGS="-L/opt/homebrew/opt/readline/lib:$LDFLAGS"
export CPPFLAGS="-I/opt/homebrew/opt/readline/include:$CPPFLAGS"
export PKG_CONFIG_PATH="/opt/homebrew/opt/readline/lib/pkgconfig:$PKG_CONFIG_PATH"
export optflags="-Wno-error=implicit-function-declaration"
export LDFLAGS="-L/opt/homebrew/opt/libffi/lib:$LDFLAGS"
export CPPFLAGS="-I/opt/homebrew/opt/libffi/include:$CPPFLAGS"
export PKG_CONFIG_PATH="/opt/homebrew/opt/libffi/lib/pkgconfig:$PKG_CONFIG_PATH"

This will ensure that the proper libraries and headers are used during the installations and it will ignore the implicit-function-declaration that is preventing some versions to continue installation. Note that for some other shells like fish the exporting of these variables will be a bit different.

Now start a new terminal session and you can try installing the older ruby versions:

asdf install ruby 2.7.2
asdf install ruby 2.6.5

Note that really old versions below 2.5 might still have issues. Most of the credits go to this Github issue.

UPDATE

For Ruby 2.2 please change the following variable:

export RUBY_CONFIGURE_OPTS=openssl@1.0

And do a

asdf reshim ruby

Thanks @xjlin0 for this update

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