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root@sergio-laptop:/home/srps# gem i date-performance Building native extensions. This could take a while... ERROR: Error installing date-performance: ERROR: Failed to build gem native extension. /usr/bin/ruby1.9.1 extconf.rb creating Makefile make Makefile:143: *** target pattern contains no `%'. Stop. Gem files will remain installed in /var/lib/gems/1.9.1:/home/srps/.gem/ruby/1.9.1/gems/date-performance-0.4.8 for inspection. Results logged to /var/lib/gems/1.9.1:/home/srps/.gem/ruby/1.9.1/gems/date-performance-0.4.8/ext/gem_make.out

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