How to install json gem - Failed to build gem native extension(mac 10.10)

Question

OS: Mac OS X 10.10.3 XCode: Latest with command line tools installed (version 6.3) Rails: version 4.2.1 Ruby: version 2.2.1

I was trying to generate the rou

Answer 1

If you are using Ruby 2.2.0 or greater, the json gem will not compile properly. You can fix this by issuing bundle update json

Answer 2

This worked for me, since I downloaded basic Ruby by accident.

1.

Install the Ruby "Development Kit" here: http://rubyinstaller.org/downloads/ Click the self-extracting file, and extract it here:

C:\RubyDevKit

(or somewhere else, but I had problems in other directories)

2.

Open the cmd (terminal): cd C:\RubyDevKit ruby dk.rb init ruby dk.rb install

Source: http://jekyll-windows.juthilo.com/1-ruby-and-devkit/

Answer 3

I encountered this problem as well, and none of the suggested fixes here solved it.

I was only able to resolve it by manually re-downloading and re-installing the appropriate version of the Xcode command line tools:

https://developer.apple.com/download/more/?name=command%20line%20tools

Answer 4

Sad, however, JSON-1.7.7 (and upto 1.8.1) is incompatible with Ruby-2.2.x. As you are using Ruby-2.2.1, it will not work for you.

There are 2 options for you:

1. Update your json gem to 1.8.2 version. -- Preferable
2. Edit ruby-2.2.1/ext/json/fbuffer/fbuffer.h file and replace problematic code with VALUE result = rb_str_new(FBUFFER_PTR(fb), FBUFFER_LEN(fb));. Look here for details

Answer 5

gem install json -v '1.8.2' worked for me.