Install problem with Synology NAS

Hello,
i tried to setup redmine on my Synology Diskstation according to that
guide
http://wiki.joachimschuster.de/index.php/Install_Ruby_on_Rails_and_Redmine_on_DS210%2B

At

in folder config run following command:

RAILS_ENV=production rake initializers/session_store.rb

i get the folowing error

RAILS_ENV=production rake initializers/session_store.rb

(in /volume1/public/redmine-0.9.4)
/opt/bin/ruby: relocation error:
/opt/lib/ruby/1.9.1/powerpc-linux-spe/bigdecimal.so: symbol __eqdf2, version
GLIB2_2.3.3 not defines in file libc.so.6 with link time reference

I have no idea what to do to fix that issue. I would be happy if anyone
knows help.
greets