===> Building for ruby34-metasploit_payloads-mettle-1.0.39
=> Removing backup files of patch before build
WARNING:  expected RubyGems version 3.6.7, was 2.7.10
WARNING:  License identifier '3-clause (or "modified") BSD' is invalid. Use an 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.
Did you mean 'BSD-3-Clause-Modification'?
WARNING:  open-ended dependency on bundler (>= 0, development) is not recommended
  use a bounded requirement, such as "~> x.y"
WARNING:  open-ended dependency on rake (>= 0, development) is not recommended
  use a bounded requirement, such as "~> x.y"
WARNING:  open-ended dependency on gem-release (>= 0, development) is not recommended
  use a bounded requirement, such as "~> x.y"
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: metasploit_payloads-mettle
  Version: 1.0.39
  File: metasploit_payloads-mettle-1.0.39.gem