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GEM Manager shows an update available for ruby-debug-base (0.10.0 => 0.10.1): Java implementation of Fast Ruby Debugger. However, it fails to install with the following error: extconf.rb:1:in `require': no such file to load -- mkmf (LoadError) from extconf.rb:1 ERROR: Error installing ruby-debug-base: ERROR: Failed to build gem native extension.
Should be fixed in RubyGems, likely. Will investigate and possibly workaround.
Actually dupe of issue 132689. *** This issue has been marked as a duplicate of 132689 ***