Can Not Install JSON Gem with Ruby 2.2.3 on Ubuntu

Why won't bundler install JSON gem?

So after a half day on this and almost immediately after posting my question I found the answer. Bundler 1.5.0 has a bug where it doesn't recognize default gems as referenced here

The solution was to update to bundler 1.5.1 using gem install bundler -v '= 1.5.1'

ruby on rails installing JSON ubuntu error

Installing the ruby1.9.1-dev package should fix this for you

sudo apt-get install ruby1.9.1-dev

An error occurred while installing json (1.8.3), and Bundler cannot continue. on Ubuntu

You are missing a libgmp-dev library.

sudo apt-get install libgmp-dev

Error while installing json gem 'mkmf.rb can't find header files for ruby'

Modern era update, as stated by mimoralea:

In case that you are using ruby 2.0 or 2.2 (thanks @patrick-davey).

sudo apt-get install ruby2.0-dev
sudo apt-get install ruby2.2-dev
sudo apt-get install ruby2.3-dev

or, generic way:

sudo apt-get install ruby-dev

or

sudo apt-get install ruby`ruby -e 'puts RUBY_VERSION[/\d+\.\d+/]'`-dev

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The first link you’ve posted is exactly your case: there is no ruby development environment installed. Development env is needed to compile ruby extensions, which are mostly written in C. Proxy has nothing to do with the problem: everything is downloaded fine, just compilation fails.

I would suggest you to install ruby-dev (ruby-devel for rpm-based distros) package onto you target machine.

gcc package might be needed as well.

Try:

$ sudo apt-get install ruby-dev

Or, for Redhat distro:

$ sudo yum install ruby-devel

Or, for [open]SuSE:

$ sudo zypper install ruby-devel

Bundle install error 'error occurred while installing json (1.7.3)'

One part of the problem is due to a change in rb_str_new.

This is a related issue on their GitHub page: https://github.com/flori/json/issues/229

As I understand it, the contributors decided to not fix this since it works as it should in json 1.8.3. It's recommended that you upgrade to that version. The json gem has a very stable API so backwards compatibility is usually not an issue.

If you are using bundler you should go to your Gemfile and change version of json to 1.8.3 or higher using gem 'json', '>=1.8.3'.

How to fix Your Ruby version is 2.3.0, but your Gemfile specified 2.2.5 while server starting

You better install Ruby 2.2.5 for compatibility. The Ruby version in your local machine is different from the one declared in Gemfile.

If you're using rvm:

rvm install 2.2.5
rvm use 2.2.5

else if you're using rbenv:

rbenv install 2.2.5
rbenv local 2.2.5

else if you can not change ruby version by rbenv,
read here

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