i manually download ruby-1.8.6.tar.gz

i installed into /home/username/package/ruby  (using --prefix)
and add the manual path into PATH variable

when i was working in irb

if i press upper arrow key then '^[[A' will come .after that if i press
enter then my irb will quit.


username / ubuntu7.04:~$ which irb
/home/username/package/ruby/bin/irb
username / ubuntu7.04:~$ irb
irb(main):001:0> 5
=> 5
irb(main):002:0> ^[[A         ----->here i pressed upper arrow key
username / subuntu7.04:~$




is it bug ? or is there any solution for this ?
 (because i want to work in irb for long time)
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