ruby 1.8.6 installation error on linux

Hi all,

i'm brand new to ruby. Just want to give it a try on linux, ruby-1.8.6

cd /share/apps/ruby-1.8.6 ./configure --prefix=`pwd`

make make install

make is ok but 'make install' encountered error. anyone knows why? Many thanks.

[ericho@bioinfo ruby-1.8.6]$ make install ./miniruby ./instruby.rb --dest-dir="" --extout=".ext" --make="make" --mflags="" --make-flags="" --installed-list .installed.list -- mantype="doc" installing binary commands installing command scripts /share/apps/ruby-1.8.6/lib/fileutils.rb:1394:in `fu_each_src_dest': same file: bin/irb and /share/apps/ruby-1.8.6/bin/irb (ArgumentError)         from /share/apps/ruby-1.8.6/lib/fileutils.rb:1411:in `fu_each_src_dest0'         from /share/apps/ruby-1.8.6/lib/fileutils.rb:1393:in `fu_each_src_dest'         from /share/apps/ruby-1.8.6/lib/fileutils.rb:840:in `install'         from ./instruby.rb:99:in `install'         from ./instruby.rb:246         from ./instruby.rb:239:in `each'         from ./instruby.rb:239         from ./instruby.rb:348:in `call'         from ./instruby.rb:348         from ./instruby.rb:345:in `each'         from ./instruby.rb:345         from ./instruby.rb:344:in `each'         from ./instruby.rb:344 make: *** [do-install-nodoc] Error 1

Eric.