Brew: 'brew cask style --fix' doesn't work on macOS Mojave

[alexunix]

Problem:
No native extension can be built for Mojave system bundled ruby. And brew uses that by default.

• [x] are reporting a bug others will be able to reproduce and not asking a question. If you're not sure or want to ask a question do so on our Discourse: https://discourse.brew.sh
• [x] ran a brew command and reproduced the problem with multiple formulae? If it's a problem with a single, official formula (not cask) please file this issue at Homebrew/homebrew-core: https://github.com/Homebrew/homebrew-core/issues/new/choose. If it's a brew cask problem please file this issue at https://github.com/Homebrew/homebrew-cask/issues/new/choose. If it's a tap (e.g. Homebrew/homebrew-php) problem please file this issue at the tap.
• [x] ran brew update and can still reproduce the problem?
• [x] ran brew doctor, fixed all issues and can still reproduce the problem?

• [x] ran brew config and brew doctor and included their output with your issue?

• brew config
  HOMEBREW_VERSION: 1.7.6 ORIGIN: https://github.com/Homebrew/brew HEAD: f239b7a62790cfb4f33bda9aab7597d43f1b1e3b Last commit: 9 days ago Core tap ORIGIN: https://github.com/Homebrew/homebrew-core Core tap HEAD: 72b19d28d6107dff677df6334cfa951e565784d1 Core tap last commit: 2 days ago HOMEBREW_PREFIX: /usr/local HOMEBREW_GIT: git HOMEBREW_MACOS_VERSION_NUMERIC: 101400 CPU: quad-core 64-bit skylake Homebrew Ruby: 2.3.7 => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby Clang: 10.0 build 1000 Git: 2.17.1 => /Applications/Xcode.app/Contents/Developer/usr/bin/git Curl: 7.54.0 => /usr/bin/curl Java: N/A macOS: 10.14-x86_64 CLT: 10.0.0.0.1.1535735448 CLT headers: N/A Xcode: 10.0 XQuartz: N/A

• brew doctor
  Your system is ready to brew.

Steps to reproduce:

1. Fresh macOS Mojave install
2. Latest brew install
3. Do brew cask style --fix google-chrome
4. Get this garbage:

==> Installing or updating 'rubocop-cask' gem
Building native extensions. This could take a while...
ERROR: Error installing rubocop-cask:
ERROR: Failed to build gem native extension.

current directory: /usr/local/Homebrew/Library/Homebrew/vendor/bundle/ruby/2.3.0/gems/jaro_winkler-1.5.1/ext/jaro_winkler

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -r ./siteconf20180928-14992-x1rx8s.rb extconf.rb
creating Makefile

current directory: /usr/local/Homebrew/Library/Homebrew/vendor/bundle/ruby/2.3.0/gems/jaro_winkler-1.5.1/ext/jaro_winkler
make "DESTDIR=" clean

current directory: /usr/local/Homebrew/Library/Homebrew/vendor/bundle/ruby/2.3.0/gems/jaro_winkler-1.5.1/ext/jaro_winkler
make "DESTDIR="
make: * No rule to make target /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/include/ruby-2.3.0/universal-darwin18/ruby/config.h', needed byadj_matrix.o'. Stop.

make failed, exit code 2

Gem files will remain installed in /usr/local/Homebrew/Library/Homebrew/vendor/bundle/ruby/2.3.0/gems/jaro_winkler-1.5.1 for inspection.
Results logged to /usr/local/Homebrew/Library/Homebrew/vendor/bundle/ruby/2.3.0/extensions/universal-darwin-18/2.3.0/jaro_winkler-1.5.1/gem_make.out
Error: Failed to install/update the 'rubocop-cask' gem.

Compiler expects header file in: /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/include/ruby-2.3.0/universal-darwin18/ruby/config.h
But actual directory with header is: /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/include/ruby-2.3.0/universal-darwin17/ruby/config.h

[MindTooth]

Care to try brew vendor-install ruby? Solved some issues for me regarding jaro_winkler.

[alexunix]

Care to try brew vendor-install ruby? Solved some issues for me regarding jaro_winkler.

Thanks, works perfectly fine now!
Maybe add a note for Mojave users? Although would be better if apple fixed it.

[MindTooth]

Glad to hear. 👍 I suspect that this issue reside only with Homebrew.

[MikeMcQuaid]

From the issue template:

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[alexunix]

Sorry but it didn't seem like necessity in this case.

So before running brew vendor-install ruby

• [x] are reporting a bug others will be able to reproduce and not asking a question. If you're not sure or want to ask a question do so on our Discourse: https://discourse.brew.sh
• [x] ran a brew command and reproduced the problem with multiple formulae? If it's a problem with a single, official formula (not cask) please file this issue at Homebrew/homebrew-core: https://github.com/Homebrew/homebrew-core/issues/new/choose. If it's a brew cask problem please file this issue at https://github.com/Homebrew/homebrew-cask/issues/new/choose. If it's a tap (e.g. Homebrew/homebrew-php) problem please file this issue at the tap.
• [x] ran brew update and can still reproduce the problem?
• [x] ran brew doctor, fixed all issues and can still reproduce the problem?

• [x] ran brew config and brew doctor and included their output with your issue?

• brew config
  HOMEBREW_VERSION: 1.7.6 ORIGIN: https://github.com/Homebrew/brew HEAD: f239b7a62790cfb4f33bda9aab7597d43f1b1e3b Last commit: 9 days ago Core tap ORIGIN: https://github.com/Homebrew/homebrew-core Core tap HEAD: 72b19d28d6107dff677df6334cfa951e565784d1 Core tap last commit: 2 days ago HOMEBREW_PREFIX: /usr/local HOMEBREW_GIT: git HOMEBREW_MACOS_VERSION_NUMERIC: 101400 CPU: quad-core 64-bit skylake Homebrew Ruby: 2.3.7 => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby Clang: 10.0 build 1000 Git: 2.17.1 => /Applications/Xcode.app/Contents/Developer/usr/bin/git Curl: 7.54.0 => /usr/bin/curl Java: N/A macOS: 10.14-x86_64 CLT: 10.0.0.0.1.1535735448 CLT headers: N/A Xcode: 10.0 XQuartz: N/A

• brew doctor
  Your system is ready to brew.

[MikeMcQuaid]

Sorry but it didn't seem like necessity in this case.

Let us decide that, please.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.