pflouret / overdrive-m4b Goto Github PK

I've tried to install this on both macOS 10.14 and 10.13 and when I run the brew install overdrive-m4b command, I get the following error (full output below). Any idea what's wrong?
Thanks!
k.

--- OUTPUT BELOW ---

==> Installing overdrive-m4b from pflouret/tap
==> Downloading https://github.com/pflouret/overdrive-m4b/archive/1.0.0.tar.gz
Already downloaded: /Users/xxxxx/Library/Caches/Homebrew/downloads/6680b7df806ed85b873fd86c2540143944c8206b808274dc069edde6c6d5a521--overdrive-m4b-1.0.0.tar.gz
==> Downloading https://rubygems.org/downloads/nokogiri-1.10.7.gem
Already downloaded: /Users/xxxxx/Library/Caches/Homebrew/downloads/15419440aa22fe1c71c291acda7f95ed3ced8c75784ac571e05c947306eee630--nokogiri-1.10.7.gem
==> gem install /Users/xxxxx/Library/Caches/Homebrew/downloads/15419440aa22fe1c71c291acda7f95ed3ced8c75784ac571e05c947306eee630--nokogiri-1.10.7.gem --ignore-dependencies --no-document --install-dir /usr/local/Cellar/overdrive-m4b/1.0.0/libexec
Last 15 lines from /Users/xxxxx/Library/Logs/Homebrew/overdrive-m4b/01.gem:
--use-system-libraries
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/dependency.rb:319:in to_specs': Could not find 'mini_portile2' (~> 2.4.0) among 15 total gem(s) (Gem::LoadError) Checked in 'GEM_PATH=/private/tmp/overdrive-m4b-20200115-86386-15oj92u/overdrive-m4b-1.0.0/.brew_home/.gem/ruby/2.3.0:/Library/Ruby/Gems/2.3.0:/usr/local/Cellar/overdrive-m4b/1.0.0/libexec:/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/gems/2.3.0', execute gem envfor more information from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/dependency.rb:328:into_spec'
from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_gem.rb:65:in gem' from extconf.rb:469:in

'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

/usr/local/Cellar/overdrive-m4b/1.0.0/libexec/extensions/universal-darwin-18/2.3.0/nokogiri-1.10.7/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/local/Cellar/overdrive-m4b/1.0.0/libexec/gems/nokogiri-1.10.7 for inspection.
Results logged to /usr/local/Cellar/overdrive-m4b/1.0.0/libexec/extensions/universal-darwin-18/2.3.0/nokogiri-1.10.7/gem_make.out