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i try to install the debugger-linecache gem , but i got the following error, Building native extensions. This could take a while... .... ERROR: Error installing debugger-linecache: ERROR: Failed to build gem native extension. /usr/bin/ruby 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 --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/ruby extconf.rb:2:in `require': no such file to load -- debugger/ruby_core_source (LoadError) from extconf.rb:2 Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/debugger-linecache-1.1.1 for inspection. Results logged to /usr/lib/ruby/gems/1.8/gems/debugger-linecache-1.1.1/ext/trace_nums/gem_make.out i have already done: sudo gem install debugger-ruby_core_source

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