我安装了这个：
# Install curl and sudo
apt-get install curl sudo
# 3 steps in 1 command :)
curl https://raw.github.com/gitlabhq/gitlab-recipes/master/install/debian_ubuntu.sh | sh
但是当我尝试第4步时
sudo gem install charlock_holmes --version '0.6.8'
我有这个错误 - 有人可以帮助我吗？
$ sudo gem install charlock_holmes --version '0.6.8'
/usr/local/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
ERROR: Loading command: install (LoadError)
cannot load such file -- zlib
ERROR: While executing gem ... (NameError)
uninitialized constant Gem::Commands::InstallCommand
$
我的错误是什么？