New subject: Problem with Markdown Preview

11 Nov 2019

      This won’t be very helpful.
But Markdown preview works on my MBP with Catalina and I installed Python  for QGIS. HomeBrew install didn’t work with QGIS, so ended up using the installer at https://www.python.org/downloads/ https://www.python.org/downloads/
...
On Nov 11, 2019, at 10:19 AM, textmate-request@lists.macromates.com wrote:
Send TextMate mailing list submissions to
   textmate@lists.macromates.com
To subscribe or unsubscribe via the World Wide Web, visit
   https://lists.macromates.com/listinfo/textmate
or, via email, send a message with subject or body 'help' to
   textmate-request@lists.macromates.com
You can reach the person managing the list at
   textmate-owner@lists.macromates.com
When replying, please edit your Subject line so it is more specific
than "Re: Contents of TextMate digest..."
Today's Topics:

Problem with Markdown Preview (Tao Zha)
Re: Problem with Markdown Preview (Graham Heath)

Message: 1
Date: Mon, 11 Nov 2019 11:39:53 -0500
From: Tao Zha zmail@tzha.net
To: tm-support@macromates.com, textmate@lists.macromates.com
Subject: [TxMt] Problem with Markdown Preview
Message-ID: A7A0E9C7-ACE3-4176-8210-2225D3B72375@tzha.net
Content-Type: text/plain; charset="us-ascii"
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