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我有這個問題，而在Ubuntu上安裝11 Rails的：導軌安裝失敗在Ubuntu與「無法加載這樣的文件 - MKMF」
[email protected]:/home/salah/rubygems-1.8.15# sudo gem install mysql
Fetching: mysql-2.8.1.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.9.1 extconf.rb
/usr/local/lib/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
from /usr/local/lib/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from extconf.rb:10:in `<main>'
Gem files will remain installed in /usr/lib/ruby/gems/1.9.1/gems/mysql-2.8.1 for inspection.
Results logged to /usr/lib/ruby/gems/1.9.1/gems/mysql-2.8.1/ext/mysql_api/gem_make.out
你有問題要安裝mysql gem，而不是Rails吧？無論如何，我不確定mysql gem是否仍然維護... mysql2' gem現在是標準的 –
[\'require'的可能重複：無需加載這樣的文件 - mkmf（LoadError）]（http： //stackoverflow.com/questions/7645918/require-no-such-file-to-load-mkmf-loaderror） – kenorb