After I updated macOS Catalina, Markdown Preview no longer works. I got the following
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
mkmf.rb can't find header files for ruby at
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
Results logged to
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?