bundle install の実行中に「pg」gem で次のエラーが発生します。gem を sqlite に変更すると、同じエラーが発生します。これは私のエラーメッセージです。
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:2:in `<main>'
Gem files will remain installed in /var/lib/gems/1.9.1/gems/pg-0.16.0 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/pg-0.16.0/ext/gem_make.out
An error occurred while installing pg (0.16.0), and Bundler cannot continue.
Make sure that `gem install pg -v '0.16.0'` succeeds before bundling.
私はapt-get install libpg-dev
gem install pg -v '0.16.0'
何も助けようとしなかった