Support for the Ruby 2.4 series has ended. See here for reference.
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A GitSpecification represents a gem that is sourced from a git repository and is being loaded through a gem dependencies file through the git: option.
Installing a git gem only involves building the extensions and generating the executables.
 
               # File rubygems/resolver/git_specification.rb, line 24
def install options = {}
  require 'rubygems/installer'
  installer = Gem::Installer.for_spec spec, options
  yield installer if block_given?
  installer.run_pre_install_hooks
  installer.build_extensions
  installer.run_post_build_hooks
  installer.generate_bin
  installer.run_post_install_hooks
end