Installation issues (debian)

I'm having trouble during the WSF/Ruby installation. I installed correctly (I think) WSF/C. Then... # sh build.sh ... make: Nothing to be done for `all'. make: Nothing to be done for `install'. ... I don't know if it is incorrect.. those two lines attracted my attention.. # ruby install.rb ... install -c -m 0755 lib/WSFC.so /usr/local/lib/site_ruby/1.8/i486-linux/WSFC.so /usr/lib/ruby/1.8/fileutils.rb:793:in `size': No such file or directory - lib/WSFC.so (Errno::ENOENT) from /usr/lib/ruby/1.8/fileutils.rb:793:in `compare_file' from /usr/lib/ruby/1.8/fileutils.rb:841:in `install' from /usr/lib/ruby/1.8/fileutils.rb:1395:in `fu_each_src_dest' from /usr/lib/ruby/1.8/fileutils.rb:1411:in `fu_each_src_dest0' from /usr/lib/ruby/1.8/fileutils.rb:1393:in `fu_each_src_dest' from /usr/lib/ruby/1.8/fileutils.rb:840:in `install' from install.rb:35 I'm sure it is not correct. What am I doing bad?