=> Bootstrap dependency digest>=20010302: found digest-20111104
=> Bootstrap dependency fetch-[0-9]*: found fetch-1.7
===> Installing for ruby18-rdoc-3.11
=> Generating pre-install file lists
=> Installing gem into installation root
ERROR:  While executing gem ... (Gem::DocumentError)
    ERROR: RDoc documentation generator not installed: no such file to load -- json
Depending on your version of ruby, you may need to install ruby rdoc/ri data:

<= 1.8.6 : unsupported
 = 1.8.7 : gem install rdoc-data; rdoc-data --install
 = 1.9.1 : gem install rdoc-data; rdoc-data --install
>= 1.9.2 : nothing to do! Yay!
Successfully installed rdoc-3.11
1 gem installed
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/ruby-rdoc
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/devel/ruby-rdoc