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Microsoft Windows [Version 6.1.7600] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Users\Sergio>gem i date-performance Building native extensions. This could take a while... ERROR: Error installing date-performance: ERROR: Failed to build gem native extension. C:/Ruby/bin/ruby.exe extconf.rb creating Makefile make make: *** No rule to make target `/C/Ruby/include/ruby-1.9.1/ruby.h', needed by `date_performance.o'. Stop. Gem files will remain installed in C:/Ruby/lib/ruby/gems/1.9.1/gems/date-perform ance-0.4.8 for inspection. Results logged to C:/Ruby/lib/ruby/gems/1.9.1/gems/date-performance-0.4.8/ext/ge m_make.out C:\Users\Sergio>make make: *** No targets specified and no makefile found. Stop.

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