when i install typo on debian, appear error like this, could you tee me how to fix this bug?: debian:~# gem install sqlite3-ruby Need to update 4 gems from http://gems.rubyforge.org .... complete Select which gem to install for your platform (i486-linux) 1. sqlite3-ruby 1.1.0 (mswin32) 2. sqlite3-ruby 1.1.0 (ruby) 3. sqlite3-ruby 1.0.1 (mswin32) 4. sqlite3-ruby 1.0.1 (ruby) 5. sqlite3-ruby 1.0.0 (ruby) 6. sqlite3-ruby 1.0.0 (mswin32) 7. sqlite3-ruby 0.9.0 (mswin32) 8. sqlite3-ruby 0.9.0 (ruby) 9. sqlite3-ruby 0.6.0 (ruby) 10. sqlite3-ruby 0.5.0 (ruby) 11. Cancel installation> 2Building native extensions. This could take a while... *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/bin/ruby1.8 --with-sqlite3-dir --without-sqlite3-dir --with-sqlite3-include --without-sqlite3-include=${sqlite3-dir}/include --with-sqlite3-lib --without-sqlite3-lib=${sqlite3-dir}/lib --with-sqlite3lib --without-sqlite3lib ERROR: While executing gem ... (RuntimeError) ERROR: Failed to build gem native extension. Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.1.0 for inspection. Results logged to /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.1.0/ext/sqlite3_api/gem_make.out