Question

I’m having problems when I try to rake db:migrate. I get the following error:

Could not find json-1.7.5 in any of the sources  
Run `bundle install` to install missing gems.

Now, I’ve already run bundle install and it gave an error when it got to json, but I try it again anyway and get the same error when it gets to json:

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‘

Gem files will remain installed in
/home/chris/.bundler/tmp/2984/gems/json-1.7.5 for inspection. Results
logged to
/home/chris/.bundler/tmp/2984/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.

The last part says to make sure gem install json -v '1.7.5' succeeds before bundling, so I run this command and json installs fine:

Building native extensions. This could take a while…
Successfully installed json-1.7.5
1 gem installed
Installing ri documentation for json-1.7.5…
Installing RDoc documentation for json-1.7.5…

But if I try rake db:migrate it starts all over again with the same errors. I’ve read about issues with json on Mac, but have had no luck with any of those solutions. Any ideas?

I’m running Ubuntu 12.04LTS, ruby 1.9.3, rails 3.2.8, gem 1.8.15 (tried it with 1.9.1 also)

Answer 1

I think that you need to install the -dev package. Try running this command

sudo aptitude install ruby1.9.1-dev

and then bundle install should work.