Docker for Mac - mkmf.rb can't find header files for ruby
RubyDockerRuby Problem Overview
I updated XCode on my Mac and since then when starting Docker using docker-sync-stack start
I get this error message:
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/include/ruby.h
I tried installing ruby with this: brew install rbenv ruby-build
but this does not change anything.
Does anybody know how I can fix it?
Thanks!
Ruby Solutions
Solution 1 - Ruby
For Xcode 11 on macOS 10.14, this can happen even after installing Xcode and installing command-line tools and accepting the license with
sudo xcode-select --install
sudo xcodebuild -license accept
The issue 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
However, Xcode 11 installs a macOS 10.14 SDK within /Library/Developer/CommandLineTools/SDKs/MacOS10.14.sdk
. It isn't necessary to pollute the system directories by installing the old header files as suggested in other answers. Instead, by selecting that SDK, the appropriate ruby2.3 headers will be found:
sudo xcode-select --switch /Library/Developer/CommandLineTools
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 while that SDK is selected.
To switch back to using the current Xcode 11 SDK, use
sudo xcode-select --switch /Applications/Xcode.app
Solution 2 - Ruby
None of the other solutions worked for me, here's what I ran to resolve the issue on Mac OS 10.14.x:
sudo rm -rf /Library/Developer/CommandLineTools
xcode-select --install
sudo xcodebuild -license accept
open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg
Solution 3 - Ruby
When upgrading XCode you need to install the Command-Line Tools and additionally accept the terms and conditions:
sudo xcode-select --install
Then:
sudo xcodebuild -license
Solution 4 - Ruby
As of Xcode 11, it seems like the ruby development headers are no longer included, so you will need to manually install them outside of Xcode Command Line Tools.
E.g. for me using rbenv i did
rbenv install 2.6.4
rbenv global 2.6.4
eval "$(rbenv init -)"
Then ran bundle install and everything worked as expected.
Solution 5 - Ruby
For Xcode 11 I fixed this by also installing of /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg
package.
Solution 6 - Ruby
Single line command fix:
On OSX Mojave I ran the following command:
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /
and it fixed the issue.
Solution 7 - Ruby
I had the same problem while installing fastlane. The tadman's answer is correct, but the command lines don't work for me with Xcode 10.2.1 (I'm not sure with other versions). You need to open Xcode, then open Preferences, select Locations and choose Command Line Tools. In my case, Command Line Tools field is empty.
Solution 8 - Ruby
As @bdorfman said in his comment, the Ruby headers are no longer included as of Xcode 11 build but they seem to try to make a new build for this as soon as possible (?): https://discuss.circleci.com/t/xcode-11-gm-seed-2-released/32505/12.
What worked for me was to use rbenv
like @bdorfman said:
rbenv install 2.6.4
rbenv global 2.6.4
eval "$(rbenv init -)"
But with the extra step of adding docker-sync
to your new ruby version. Since after you change the ruby version (for example)
$ ruby -v
ruby 2.6.4p104 (2019-08-28 revision 67798) [x86_64-darwin18]
And then running gem list:
$ gem list
bigdecimal (default: 1.4.1)
bundler (default: 1.17.2)
cmath (default: 1.0.0)
csv (default: 3.0.9)
date (default: 2.0.0)
dbm (default: 1.0.0)
did_you_mean (1.3.0)
e2mmap (default: 0.1.0)
etc (default: 1.0.1)
fcntl (default: 1.0.0)
fiddle (default: 1.0.0)
fileutils (default: 1.1.0)
forwardable (default: 1.2.0)
io-console (default: 0.4.7)
ipaddr (default: 1.2.2)
irb (default: 1.0.0)
json (default: 2.1.0)
logger (default: 1.3.0)
matrix (default: 0.1.0)
minitest (5.11.3)
mutex_m (default: 0.1.0)
net-telnet (0.2.0)
openssl (default: 2.1.2)
ostruct (default: 0.1.0)
power_assert (1.1.3)
prime (default: 0.1.0)
psych (default: 3.1.0)
rake (12.3.2)
rdoc (default: 6.1.2)
rexml (default: 3.1.9)
rss (default: 0.2.7)
scanf (default: 1.0.0)
sdbm (default: 1.0.0)
shell (default: 0.7)
stringio (default: 0.0.2)
strscan (default: 1.0.0)
sync (default: 0.5.0)
test-unit (3.2.9)
thwait (default: 0.1.0)
tracer (default: 0.1.0)
webrick (default: 1.4.2)
xmlrpc (0.3.0)
zlib (default: 1.0.0)
(does not contains docker-sync)
If you run the gem install for docker-sync you will use the docker-sync for your rbenv managed ruby.
$ gem install docker-sync
Solution 9 - Ruby
If you want to get a deeper insight into the issue:
> Mac OS X 10.14 has stopped placing the include libraries in their
> usual location, /usr/include, keeping them only inside the XCode
> directory.
>
> To confirm that this is the problem, simply run ls /usr/include
. If
> the result comes out empty, its really this problem.
>
> Apple ships a “legacy installer” for you to be able to install the
> headers in the “old location”.
> To fix the problem just run this:
>
> sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg > -target /
Solution 10 - Ruby
Running open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg
in the terminal opens the package installation wizard. After properly installing was I able to proceed.
MacOS 10.4.4
Solution 11 - Ruby
Open Terminal
xcode-select --install
sudo xcodebuild -license accept
curl -L https://get.rvm.io | bash -s stable
Close and Reopen Terminal
rvm install ruby-2.6
sudo gem install cocoapods
pod install
After completing right click on project top-left on android studio then click on Flutter -> Open IOS Module in Xcode