Rails - Apr 2009 - Oracle oci8 => OCIError: OCI Library Initialization Error

I''m trying to get ActiveRecord working with an Oracle DB over the
instant client.

On a 32bit machine, I can require ''oci8'':
Linux xxx.xxx.xxx.xxx 2.6.9-78.0.17.ELsmp #1 SMP Thu Mar 5 04:52:17 EST
2009 i686 i686 i386 GNU/Linux
irb(main):001:0> require ''oci8''
=> true

However, on a 64bit machine:
Linux xxx.xxx.xxx.xxx 2.6.18-128.1.6.el5 #1 SMP Tue Mar 24 12:05:57 EDT
2009 x86_64 x86_64 x86_64 GNU/Linux

I have this problem:
irb(main):001:0> require ''oci8''
OCIError: OCI Library Initialization Error
  from env.c:90:in oci8lib.so
  from /home/iono/lib/ruby/rubygems/custom_require.rb:31:in `require''
  from /home/iono/packages/gems/gems/ruby-oci8-2.0.1/lib/oci8.rb:25
  from /home/iono/lib/ruby/rubygems/custom_require.rb:36:in
`gem_original_require''
  from /home/iono/lib/ruby/rubygems/custom_require.rb:36:in `require''
  from (irb):1


Any clues?
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bump for ideas :)
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