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...recieve below, if anyone has any solution for hese issues , i''ll be immensely grateful. 1) gem install rjb Temporarily enhancing PATH to include DevKit... Building native extensions. This could take a while... ERROR: Error installing rjb: ERROR: Failed to build gem native extension. C:/RailsInstaller/Ruby1.8.7/bin/ruby.exe extconf.rb *** 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...