No, you shutta-upa

yaml.rb.diff

diff a/lib/yaml.rb b/lib/yaml.rb
--- a/lib/yaml.rb
+++ b/lib/yaml.rb
@@ -57,9 +58,6 @@
     require 'psych'
     engine = 'psych'
   rescue LoadError
-    warn "#{caller[0]}:"
-    warn "It seems your ruby installation is missing psych (for YAML output)."
-    warn "To eliminate this warning, please install libyaml and reinstall your ruby."
     require 'syck'
     engine = 'syck'
   end