root@LAPTOP-F2FKVH30:~# gem specific_install https://github.com/sciruby-jp/rubydown
/usr/bin/git
http installing from https://github.com/sciruby-jp/rubydown
Cloning into '/tmp/d20190309-43-1fwpq90'...
remote: Enumerating objects: 192, done.
remote: Counting objects: 100% (192/192), done.
remote: Compressing objects: 100% (134/134), done.
remote: Total 334 (delta 76), reused 162 (delta 51), pack-reused 142
Receiving objects: 100% (334/334), 2.06 MiB | 813.00 KiB/s, done.
Resolving deltas: 100% (133/133), done.
Checking out files: 100% (48/48), done.
WARNING: exe/rubydown is not executable
WARNING: open-ended dependency on kramdown (>= 0) is not recommended
use a bounded requirement, such as '~> x.y'
WARNING: open-ended dependency on pry (>= 0) is not recommended
use a bounded requirement, such as '~> x.y'
WARNING: open-ended dependency on daru (>= 0) is not recommended
use a bounded requirement, such as '~> x.y'
WARNING: open-ended dependency on numo-narray (>= 0) is not recommended
use a bounded requirement, such as '~> x.y'
WARNING: open-ended dependency on numo-gnuplot (>= 0) is not recommended
use a bounded requirement, such as '~> x.y'
WARNING: open-ended dependency on rbplotly (>= 0) is not recommended
use a bounded requirement, such as '~> x.y'
WARNING: open-ended dependency on test-unit (>= 0, development) is not recommended
use a bounded requirement, such as '~> x.y'
WARNING: See http://guides.rubygems.org/specification-reference/ for help
Successfully built RubyGem
Name: rubydown
Version: 0.1.0
File: rubydown-0.1.0.gem
Fetching addressable-2.6.0.gem
Fetching faraday-0.15.4.gem
Fetching multipart-post-2.0.0.gem
Fetching public_suffix-3.0.3.gem
Fetching launchy-2.4.3.gem
Fetching rbplotly-0.1.2.gem
Fetching uuidtools-2.1.5.gem
Fetching numo-gnuplot-0.2.4.gem
Fetching numo-narray-0.9.1.4.gem
Fetching backports-3.12.0.gem
Fetching packable-1.3.10.gem
Fetching daru-0.2.1.gem
Fetching coderay-1.1.2.gem
Fetching method_source-0.9.2.gem
Fetching pry-0.12.2.gem
Fetching kramdown-2.1.0.gem
Building native extensions. This could take a while...
/usr/local/lib/site_ruby/2.5.0/rubygems/ext/builder.rb:183: warning: conflicting chdir during another chdir block
/usr/local/lib/site_ruby/2.5.0/rubygems/ext/builder.rb:191: warning: conflicting chdir during another chdir block
Successfully installed
These warnings should be removed.