Fail to Building native extensions. on Mac OSX 10.13.6

[fascox]

Building native extensions. This could take a while...
ERROR: Error installing solargraph:
ERROR: Failed to build gem native extension.

current directory: /Library/Ruby/Gems/2.3.0/gems/eventmachine-1.2.7/ext

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -r ./siteconf20180912-38268-nmeu8e.rb extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.3.0/gems/eventmachine-1.2.7 for inspection.
Results logged to /Library/Ruby/Gems/2.3.0/extensions/universal-darwin-17/2.3.0/eventmachine-1.2.7/gem_make.out

[castwide]

It looks like you don't have the Ruby development headers installed. The easiest way I know to get them on OSX is to install XCode.

Relevant links:

https://stackoverflow.com/questions/761521/when-i-try-sudo-gem-install-json-i-get-the-following-error

https://kevinpotgieter.wordpress.com/2012/12/06/ruby-gem-install-mkmf-rb-cant-find-header-files-for-ruby-problem/

[fascox]

xcode-select --install

and

sudo xcodebuild -license

solve the issue.

[acalism]

xcode-select --install

and

sudo xcodebuild -license

solve the issue.

After your commands, restarting macOS is required for me.

[xclidongbo]

macos 10.14.6.
same error.

[naffan2014]

same error

[Calebvh]

Same error, (trying to install Jazzy)
current directory: /Library/Ruby/Gems/2.3.0/gems/redcarpet-3.5.0/ext/redcarpet
xcode-select --install
and
sudo xcodebuild -license
and then subsequent restart have not worked, any suggestions?

[castwide]

You might need to install the command line tools: https://kevinpotgieter.wordpress.com/2012/12/06/ruby-gem-install-mkmf-rb-cant-find-header-files-for-ruby-problem/

[Calebvh]

Unfortunately I already have them installed, any other ideas?

[castwide]

This might be specific to MacOS 10.14. Apparently some development files got moved, or stopped getting installed by default, or...something. A couple of people have recommended running some variation of this:

open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

References:

• https://blog.driftingruby.com/updated-to-mojave/
• https://desiredpersona.com/install-jekyll-on-macos/
• https://stackoverflow.com/questions/46377667/docker-for-mac-mkmf-rb-cant-find-header-files-for-ruby

[Calebvh]

Yes, I was just about to post.
navigating to that package location and then entering:
sudo installer -pkg macOS_SDK_headers_for_macOS_10.14.pkg -target / 
This did the trick for me, thanks for your help!

[ChrisMash]

Running the .pkg in ~/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg worked for me, so thanks for the tips!

Incidentally a colleague of mine didn't have that packages folder on his machine. I'd install the Xcode 11 update from the App Store and he'd deleted and installed from the download from the apple developer site, so there may be a difference for people if they don't use the App Store (maybe you can get the pkg from the apple developer site downloads page?)

[jasonivers]

Installing the package fixed that problem for me, but it's not picking up my RVM ruby version when I do bundle install now... even though ruby --version DOES display it. Any ideas?

[jkuebart]

The cause is that Xcode 11 ships the macOS 10.15 SDK which includes headers for ruby2.6, but not for macOS 10.14's ruby2.3. You can verify that this is your problem by running

ruby -rrbconfig -e 'puts RbConfig::CONFIG["rubyhdrdir"]'   

which on macOS 10.14 with Xcode 11 prints the non-existent path

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/include/ruby-2.3.0

There might still be a macOS 10.14 SDK in /Library/Developer/CommandLineTools/SDKs. It isn't necessary to pollute the system directories by installing the old header files as suggested above. Instead, by pointing the SDKROOT environment variable to it, the appropriate ruby2.3 headers will be found:

SDKROOT=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/
export SDKROOT
ruby -rrbconfig -e 'puts RbConfig::CONFIG["rubyhdrdir"]'

This should now correctly print

/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk//System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/include/ruby-2.3.0

Likewise, gem install should work when the SDKROOT environment variable is set.

[mackworth]

For me (Xcode 11 on Mojave as well), gem install didn't seem to use the SDKROOT, even though RBConfig returned the right value. This suggestion on StackOverflow worked instead, so I'm passing it on here:

sudo xcode-select --switch /Library/Developer/CommandLineTools
and then restore afterwards with
sudo xcode-select --switch /Applications/Xcode.app

Reference: https://stackoverflow.com/a/58231417/580850

[ccarpita]

If you are on OSX 10.15+, the headers package is no longer available. I fixed this issue by setting SDKROOT in my shell configuration to the value provided by xcrun, which should be mostly future-proof:

export SDKROOT=$(xcrun --show-sdk-path)

[boxabirds]

This might be specific to MacOS 10.14. Apparently some development files got moved, or stopped getting installed by default, or...something. A couple of people have recommended running some variation of this:

open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

References:

• https://blog.driftingruby.com/updated-to-mojave/
• https://desiredpersona.com/install-jekyll-on-macos/
• https://stackoverflow.com/questions/46377667/docker-for-mac-mkmf-rb-cant-find-header-files-for-ruby

Thanks! I'm on 10.14.4 and this was still necessary.

[shengyongniu]

For me (Xcode 11 on Mojave as well), gem install didn't seem to use the SDKROOT, even though RBConfig returned the right value. This suggestion on StackOverflow worked instead, so I'm passing it on here:

sudo xcode-select --switch /Library/Developer/CommandLineTools
and then restore afterwards with
sudo xcode-select --switch /Applications/Xcode.app

Reference: https://stackoverflow.com/a/58231417/580850

Thank you sir!

[mineschan]

If you are on OSX 10.15+, the headers package is no longer available. I fixed this issue by setting SDKROOT in my shell configuration to the value provided by xcrun, which should be mostly future-proof:

export SDKROOT=$(xcrun --show-sdk-path)

Only this solve my issue! Salute Sir!

[nomasprime]

Nothing worked for me on 10.15.7.

[philippfrank]

None of the above worked on 10.15.7 (Catalina). However, I got it up and running using rbenv:

rbenv global 2.7.4
gem install solargraph

[castwide]

Ruby on MacOS is frequently problematic, especially if you're using whatever janky version of Ruby ships with the OS, which often does not include the stuff you need to natively compile depenencies like Nokogiri. The problems are not limited to Solargraph. One common solution is to use rbenv, which Solargraph makes an effort to support.