$ bundle install
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
(abridgement)
An error occurred while installing ffi (1.13.0), and Bundler cannot continue.
Make sure that `gem install ffi -v '1.13.0'` succeeds before bundling.
In Gemfile:
guard-rspec was resolved to 4.7.3, which depends on
guard was resolved to 2.16.2, which depends on
listen was resolved to 3.2.1, which depends on
rb-inotify was resolved to 0.10.1, which depends on
ffi
$ gem install ffi -v '1.13.0'
Building native extensions. This could take a while...
ERROR: Error installing ffi:
ERROR: Failed to build gem native extension.
...
Even if the command is executed according to the error, an error occurs
$ xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
It was already installed.
$ sudo xcodebuild -license accept
Solved when I executed.
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