Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
tcltklib.so
tkutil.so
ruby-tk

Requires :

rpmlib(PayloadIsBzip2) <= 3.0.5-1
libtcl8.4.so
libc.so.6(GLIBC_2.0)
libdl.so.2
ruby = 1.8.7.p357
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libtk8.4.so
libm.so.6
libX11.so.6
librt.so.1
rpmlib(CompressedFileNames) <= 3.0.4-1
libcrypt.so.1
libc.so.6(GLIBC_2.1.3)
libruby.so.1.8
libc.so.6
libc.so.6(GLIBC_2.3.4)

Content of RPM :
/usr/lib/ruby/1.8/i586-linux/tcltklib.so
/usr/lib/ruby/1.8/i586-linux/tkutil.so
/usr/lib/ruby/1.8/multi-tk.rb
/usr/lib/ruby/1.8/remote-tk.rb
/usr/lib/ruby/1.8/tcltk.rb
/usr/lib/ruby/1.8/tk
/usr/lib/ruby/1.8/tk.rb
/usr/lib/ruby/1.8/tk/after.rb
/usr/lib/ruby/1.8/tk/autoload.rb
/usr/lib/ruby/1.8/tk/bgerror.rb
/usr/lib/ruby/1.8/tk/bindtag.rb
/usr/lib/ruby/1.8/tk/button.rb
/usr/lib/ruby/1.8/tk/canvas.rb
/usr/lib/ruby/1.8/tk/canvastag.rb
/usr/lib/ruby/1.8/tk/checkbutton.rb
/usr/lib/ruby/1.8/tk/clipboard.rb
/usr/lib/ruby/1.8/tk/clock.rb
/usr/lib/ruby/1.8/tk/composite.rb
/usr/lib/ruby/1.8/tk/console.rb
/usr/lib/ruby/1.8/tk/dialog.rb
/usr/lib/ruby/1.8/tk/encodedstr.rb
/usr/lib/ruby/1.8/tk/entry.rb
/usr/lib/ruby/1.8/tk/event.rb
/usr/lib/ruby/1.8/tk/font.rb
/usr/lib/ruby/1.8/tk/frame.rb
/usr/lib/ruby/1.8/tk/grid.rb
/usr/lib/ruby/1.8/tk/image.rb
/usr/lib/ruby/1.8/tk/itemconfig.rb
/usr/lib/ruby/1.8/tk/itemfont.rb
/usr/lib/ruby/1.8/tk/kinput.rb
There is 313 files more in these RPM.