Sass is not working & Can't install ruby-sass on macOS Catalina

问题

Ruby sass is not working after upgrading to macOS Catalina beta.

When I run sudo gem install sass, I'm getting an error:

ERROR:  Error installing sass:
    ERROR: Failed to build gem native extension.

    current directory: /Library/Ruby/Gems/2.6.0/gems/ffi-1.11.1/ext/ffi_c
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /Library/Ruby/Site/2.6.0 -r ./siteconf20191007-37566-177grvx.rb extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/include/ruby.h

You might have to install separate package for the ruby development
environment, ruby-dev or ruby-devel for example.

extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.6.0/gems/ffi-1.11.1 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-19/2.6.0/ffi-1.11.1/gem_make.out```

回答1:

Problem solved, here's the solution

Open terminal & run these code

• Step 1: brew update
• Step 2: xcode-select --install
• Step 3: sudo gem install -n /usr/local/bin sass

Now check your sass version: sass -v

回答2:

Let me start by pressing people not to install gems with sudo. Since Catalina, user permissions changed for core/system files, which perfectly makes sense. This way no program can change the core files and they are save and secure.

Now the correct way to solve this issue is to install an additional Ruby build in your home folder which can be altered and tempered with.

1. brew update && brew install rbenv ruby-build
2. xcode-select --install
3. vim ~/.zshenv
4. add the following to the opened file export PATH="$HOME/.rbenv/bin:$PATH"
5. vim ~/.zshrc
6. add the following to the opened file:

source $HOME/.zshenv
eval "$(rbenv init - zsh)"

7. source ~/.zshrc
8. rbenv install 2.6.4 or any version you feel comfortable with
9. rbenv global 2.6.4
10. ruby -v check current running ruby version
11. ruby -e "puts (1..100).reduce(:+)" outputs 5050
12. Now install any gem you want gem install sass

回答3:

Since macOS Catalina has removed ruby from the base install, you are no longer able to execute the sass executable installed via gem.

However, you can install Dart Sass as instructed on the sass website:

Install on Mac OS X (Homebrew)

If you use the Homebrew package manager for Mac OS X, you can install Dart Sass by running

brew install sass/sass/sass

---

Before doing this however, it may be wise to uninstall the instance of sass that was installed via gem

gem uninstall sass

If you come across any issues with linking the sass that was installed via brew, you may need to manually link it (brew will usually tell you this if it is the case)

brew link --overwrite sass

来源：https://stackoverflow.com/questions/58262697/sass-is-not-working-cant-install-ruby-sass-on-macos-catalina