So, I don’t know what changed. Apparently some ruby gems have a fancy new way of building themselves and it gives this lovely complaint on Snow Leopard:

make install
/opt/local/bin/ginstall -c -m 0755 nokogiri.bundle /usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.0/lib/nokogiri
make: /opt/local/bin/ginstall: No such file or directory
make: *** [/usr/local/lib/ruby/gems/1.8/gems/nokogiri-1.4.0/lib/nokogiri/nokogiri.bundle] Error 1

Oh man.

BUT, I FIGURED IT OUT. So, after a crap load of Googling… ginstall is the same thing as install. Thusly this should solve your problem.

sudo ln -s /usr/bin/install /opt/local/bin/ginstall

Enjoy!