=> Bootstrap dependency digest>=20211023: found digest-20220214
===> Building for ruby33-tmail-1.2.7.1nb2
=> Removing backup files of patch before build
WARNING:  licenses is empty, but is recommended. Use an license identifier from
https://spdx.org/licenses or 'Nonstandard' for a nonstandard license,
or set it to nil if you don't want to specify a license.
WARNING:  make sure you specify the oldest ruby version constraint (like ">= 3.0") that you want your gem to support by setting the `required_ruby_version` gemspec attribute
WARNING:  See https://guides.rubygems.org/specification-reference/ for help
  Successfully built RubyGem
  Name: tmail
  Version: 1.2.7.1
  File: tmail-1.2.7.1.gem