Hello, I try to install instiki on macOS but the gem file always produce an error:

Fetching https://github.com/distler/maruku.git Fetching gem metadata from http://rubygems.org/……. Fetching version metadata from http://rubygems.org/. Resolving dependencies… nokogiri-1.7.0.1 requires ruby version >= 2.1.0, which is incompatible with the current version, ruby 2.0.0p648

Anybody can help here?

Hmmm. That’s unexpected. You can edit the Gemfile to replace the line

gem "nokogiri", '~>1.7.0'

with

gem "nokogiri", '~>1.6.0'

which should work fine.

Or you can install a more recent version of Ruby (current is 2.4.0; you have 2.0.0).