=> Bootstrap dependency digest>=20010302: found digest-20180917
===> Building for ruby25-rack-2.0.6
=> Override gemspec dependency
rackup => rackup20
bin/rackup => bin/rackup20
=> Removing backup files of patch before build
  Successfully built RubyGem
  Name: rack
  Version: 2.0.6
  File: rack-2.0.6.gem