Installation of Ruby-OAuth pkg with Ruby gems more platform independently?

Question

I want to get this package ruby-auth here, originally developed for Debian, working more platform-independtly. I am able to use it with Debian but macOS's brew package manager does not contain it. I would like to get the same tool working more platform-independently so trying to get the oauth working from gems but the errors below.

How to get the Oauth1 command line tool working more platform-independent way?

Ruby Gems leading to some error

Can I get the oauth tool somehow to work with gems pkg-manager?

$ gem install oauth
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.

and even with sudo some error (I would like to avoid using sudo, not to mess up the originals)

$ sudo gem install oauth
$ oauth 
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in

require': cannot load such file -- active_support/core_ext/string/inflections (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in require' from /Library/Ruby/Gems/2.0.0/gems/oauth-0.5.3/lib/oauth/cli.rb:8:in <top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in require' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in require' from /Library/Ruby/Gems/2.0.0/gems/oauth-0.5.3/bin/oauth:4:in' from /usr/local/bin/oauth:23:in load' from /usr/local/bin/oauth:23:in'

Answer 1

I tested the activesupport dependency doubt, as commented by max pleaner, such that

gem install activesupport oauth

and this fixed the oauth's LoadError in both macOS and Windows 10 Enterprise. In Windows 10, I used the newest 2.4.1 installation medium of RubyInstaller.org.