/usr/lib/ruby/vendor_ruby/case_sensitive_require/RedCloth.rb is in ruby-redcloth 4.2.8-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # A workaround to make Rails 2.1 gem dependency easier on case-sensitive filesystems.
# Since the gem name is RedCloth and the file is redcloth.rb, config.gem 'RedCloth' doesn't
# work. You'd have to use config.gem 'RedCloth', :lib => 'redcloth', and that's not
# immediately obvious. This file remedies that.
#
require File.join(File.dirname(__FILE__), '..', 'redcloth')
|