Hi: After I updated macOS Catalina, Markdown Preview no longer works. I got the following error message: Please install the Redcarpet and Pygments.rb RubyGems by running the following: /usr/bin/gem install --user redcarpet pygments.rb After I ran the above command, I received the following error message from the Terminal: $ /usr/bin/gem install --user redcarpet pygments.rb Building native extensions. This could take a while... ERROR: Error installing redcarpet: ERROR: Failed to build gem native extension. current directory: /Users/tzha/.gem/ruby/2.6.0/gems/redcarpet-3.5.0/ext/redcarpet /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0 -r ./siteconf20191111-836-11oqvm2.rb extconf.rb mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/include/ruby.h You might have to install separate package for the ruby development environment, ruby-dev or ruby-devel for example. extconf failed, exit code 1 Gem files will remain installed in /Users/tzha/.gem/ruby/2.6.0/gems/redcarpet-3.5.0 for inspection. Results logged to /Users/tzha/.gem/ruby/2.6.0/extensions/universal-darwin-19/2.6.0/redcarpet-3.5.0/gem_make.out Successfully installed pygments.rb-1.2.1 Parsing documentation for pygments.rb-1.2.1 Done installing documentation for pygments.rb after 0 seconds 1 gem installed Can someone help me to resolve this issue? Thanks, Tao

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