=> Bootstrap dependency digest>=20010302: found digest-20190127
===> Building for ruby26-cucumber-core-4.0.0
=> Removing backup files of patch before build
WARNING:  open-ended dependency on backports (>= 3.8.0) is not recommended
  if backports is semantically versioned, use:
    add_runtime_dependency 'backports', '~> 3.8', '>= 3.8.0'
WARNING:  open-ended dependency on rake (>= 0.9.2, development) is not recommended
  if rake is semantically versioned, use:
    add_development_dependency 'rake', '~> 0.9', '>= 0.9.2'
WARNING:  open-ended dependency on unindent (>= 1.0, development) is not recommended
  if unindent is semantically versioned, use:
    add_development_dependency 'unindent', '~> 1.0'
WARNING:  open-ended dependency on yard (>= 0, development) is not recommended
  use a bounded requirement, such as '~> x.y'
WARNING:  See http://guides.rubygems.org/specification-reference/ for help
  Successfully built RubyGem
  Name: cucumber-core
  Version: 4.0.0
  File: cucumber-core-4.0.0.gem