2

I just cleaned rvm and ruby and reinstalled it. I am trying to install rails but I get this error:

gem install rails -v 3.2.9

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

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out

And if I run bundle install with my Gemfile which has rails 3.2.9 and a few more gems I get this error:

An error occurred while installing json (1.8.1), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.1'` succeeds before bundling.

Guess what. Running the suggested command gives me another error:

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

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.8.1 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.8.1/ext/json/ext/generator/gem_make.out
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dabadaba
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2 Answers2

5

Possible duplicate of:

Depending on your ruby version, run:

sudo apt-get install ruby1.9.1-dev
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MrYoshiji
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1

A simple google search points to this earlier stackoverflow question:

Why do I get an error installing the JSON gem in Ubuntu?

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

sudo apt-get install ruby1.9.1-dev

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Nikita Barsukov
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