Mac mini（Catalina）に 旧環境（iMac）で使っているgemたちをインストール

「ruby-mysql」は成功
「jubatus」は失敗。「cool.io」で失敗。前にあったかな？


$ sudo gem install ruby-mysql
Password:
Fetching ruby-mysql-2.9.14.gem
Successfully installed ruby-mysql-2.9.14
Parsing documentation for ruby-mysql-2.9.14
Installing ri documentation for ruby-mysql-2.9.14
Done installing documentation for ruby-mysql after 0 seconds
1 gem installed
$



$ sudo gem install jubatus
Fetching jubatus-1.1.0.gem
Fetching msgpack-rpc-0.6.0.gem
Fetching msgpack-1.3.1.gem
Fetching cool.io-1.4.6.gem
Building native extensions. This could take a while...
ERROR: Error installing jubatus:
ERROR: Failed to build gem native extension.

current directory: /Library/Ruby/Gems/2.6.0/gems/cool.io-1.4.6/ext/cool.io
/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 ./siteconf20200117-5829-12r70b6.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 /Library/Ruby/Gems/2.6.0/gems/cool.io-1.4.6 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-19/2.6.0/cool.io-1.4.6/gem_make.out
$