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if ENV["RUBYOPT"] || defined? Gem
  ENV.delete "RUBYOPT"

  require "rbconfig"
  cmd = [RbConfig.ruby, "--disable-gems", "build.rb", *ARGV]

  exec(*cmd)
end

require "tmpdir"

lp = File.expand_path("../../../../lib", __dir__)
gem = ["ruby", "-I#{lp}", File.expand_path("../../../../bin/gem", __dir__)]
gemspec = File.expand_path("custom_name.gemspec", __dir__)

Dir.mktmpdir("custom_name") do |dir|
  built_gem = File.expand_path(File.join(dir, "custom_name.gem"))
  system(*gem, "build", gemspec, "--output", built_gem)
  system(*gem, "install", "--verbose", "--local", built_gem, *ARGV)
  system %q(ruby -rcustom_name -e "puts 'Result: ' + CustomName.say_hello")
end