Troubleshooting when Setting up Github Page

At the step of setting up Ruby locally for testing, I got this:

Fetching gem metadata from https://rubygems.org/..............
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies.....
Fetching concurrent-ruby 1.1.4
Installing concurrent-ruby 1.1.4
Fetching i18n 0.9.5
Installing i18n 0.9.5
Fetching minitest 5.11.3
Installing minitest 5.11.3
Fetching thread_safe 0.3.6
Installing thread_safe 0.3.6
Fetching tzinfo 1.2.5
Installing tzinfo 1.2.5
Fetching activesupport 4.2.10
Installing activesupport 4.2.10
Fetching public_suffix 2.0.5
Installing public_suffix 2.0.5
Fetching addressable 2.5.2
Installing addressable 2.5.2
Using bundler 1.17.3
Fetching coffee-script-source 1.11.1
Installing coffee-script-source 1.11.1
Fetching execjs 2.7.0
Installing execjs 2.7.0
Fetching coffee-script 2.4.1
Installing coffee-script 2.4.1
Fetching colorator 1.1.0
Installing colorator 1.1.0
Fetching ruby-enum 0.7.2
Installing ruby-enum 0.7.2
Fetching commonmarker 0.17.13
Installing commonmarker 0.17.13 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory:
/home/boris/workspace/my_Github_Website/codemonkeyboris.github.io/vendor/bundle/ruby/2.5.0/gems/commonmarker-0.17.13/ext/commonmarker
/usr/bin/ruby2.5 -r ./siteconf20181231-18337-kelz2o.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in
/home/boris/workspace/my_Github_Website/codemonkeyboris.github.io/vendor/bundle/ruby/2.5.0/gems/commonmarker-0.17.13 for inspection.
Results logged to
/home/boris/workspace/my_Github_Website/codemonkeyboris.github.io/vendor/bundle/ruby/2.5.0/extensions/x86_64-linux/2.5.0/commonmarker-0.17.13/gem_make.out

An error occurred while installing commonmarker (0.17.13), and Bundler cannot continue.
Make sure that `gem install commonmarker -v '0.17.13' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  github-pages was resolved to 193, which depends on
    jekyll-commonmark-ghpages was resolved to 0.1.5, which depends on
      jekyll-commonmark was resolved to 1.2.0, which depends on
        commonmarker

#####################################################

Solution:

$sudo apt-get install ruby-all-dev

$bundle install --path vendor/bundle

ref:

https://help.github.com/articles/setting-up-your-github-pages-site-locally-with-jekyll/

https://github.com/github/pages-gem/issues/133