ruby on rails installing JSON ubuntu error

Question

Hey I am new to rails (as well as linux) and I keep getting this error:

Installing json (1.7.5) with native extensions 
Gem::Installer::ExtensionBuildError: 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 /home/jack/.bundler/tmp/10426/gems/json-1.7.5 for inspection.
Results logged to /home/jack/.bundler/tmp/10426/gems/json-1.7.5/ext/json/ext/generator/gem_make.out
An error occurred while installing json (1.7.5), and Bundler cannot continue.
Make sure that `gem install json -v '1.7.5'` succeeds before bundling.
jack@jack-ThinkCentre:~/rails_projects/sample_app$

I cant install the gem individually or with bundle install. I used rvm to install rails. thanks in advance.

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-1.7.5 for inspection. Results logged to /var/lib/gems/1.9.1/gems/json-1.7.5/ext/json/ext/generator/gem_make.out — Jakxna360
– Jakxna360, Commented Nov 30, 2012 at 20:48
Is this the first time using rails? What's ur OS? If OSX: What XCode version do u have (xcodebuild -version)? — hrr
– hrr, Commented Nov 30, 2012 at 20:55
I get this error: 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-1.7.5 for inspection. Results logged to /var/lib/gems/1.9.1/gems/json-1.7.5/ext/json/ext/generator/gem_make.out — Jakxna360
– Jakxna360, Commented Nov 30, 2012 at 21:32

niels · Accepted Answer · 2013-08-29 15:04:36Z

10

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

sudo apt-get install ruby1.9.1-dev

edited Aug 29, 2013 at 15:04

niels

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answered Dec 1, 2012 at 5:33

Gowri Naidu R

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Leopold · Accepted Answer · 2015-11-11 21:51:36Z

2

"The same issue on ubuntu-trusty-64 running ruby 2.2.3. the solution is to install libgmp3-dev."

sudo apt-get install libgmp3-dev

answered Nov 11, 2015 at 21:51

Leopold

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