Ubuntuを使用して、「bundle install
"my Rails環境をセットアップするには、JSON gemのインストール中にエラーがスローされます。
Installing json (1.7.3) 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/danny/.bundler/tmp/2040/gems/json-1.7.3 for inspection.
Results logged to /home/danny/.bundler/tmp/2040/gems/json-1.7.3/ext/json/ext/parser/gem_make.out
An error occured while installing json (1.7.3), and Bundler cannot continue.
Make sure that `gem install json -v '1.7.3'` succeeds before bundling.
JSON 1.7.3 gemのみをインストールしようとすると、エラーも発生します。
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-1.7.3 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/json-1.7.3/ext/json/ext/parser/gem_make.out
RVMをインストールして実行中Ruby 1.9.3;なぜJSON gemをインストールできないのですか?
Ruby1.9.1-dev
パッケージをインストールすると、これが修正されます。
Sudo apt-get install Ruby1.9.1-dev