gem install \\\
-V \\\
--local \\\
--install-dir %{-d*}%{!?-d:.%{gem_dir}} \\\
--bindir .%{_bindir} \\\
--force \\\
--document=ri,rdoc \\\
%{-n*}%{!?-n:%{gem_name}-%{version}.gem} \
%{nil}
Thanks for your help
Athenas