Building Logstash fails due to amazing_print version mismatch

+ rake bootstrap
mkdir -p vendor
mkdir vendor/_
mkdir -p build
mkdir -p build/bootstrap
Installing minitar 0.5.4 because the build process needs it.
[bootstrap] Fetching and installing gem: minitar (0.5.4)
Successfully installed minitar-0.5.4
1 gem installed
Installing bundler ~> 1.9.4 because the build process needs it.
[bootstrap] Fetching and installing gem: bundler (~> 1.9.4)
Successfully installed bundler-1.9.10
1 gem installed
Invoking bundler install...
Error Bundler::InstallError, retrying 1/10
An error occurred while installing amazing_print (1.2.2), and Bundler cannot continue.
Make sure that `gem install amazing_print -v '1.2.2'` succeeds before bundling.

(snip)

Error Bundler::InstallError, retrying 10/10
An error occurred while installing amazing_print (1.2.2), and Bundler cannot continue.
Make sure that `gem install amazing_print -v '1.2.2'` succeeds before bundling.
Too many retries, aborting, caused by Bundler::InstallError
rake aborted!
Bundler::InstallError: An error occurred while installing amazing_print (1.2.2), and Bundler cannot continue.
Make sure that `gem install amazing_print -v '1.2.2'` succeeds before bundling.