ruby-oci8 文档http://ruby-oci8.rubyforge.org/en/file.install-instant-client.html 提示在 64 位 mac os 系统使用 32 位 ruby 版本来安装 32 位 ruby-oci8. 但是我在 ruby1.8/1.9 版本都安装失败，有哪位成功安装这个 gem 的分享下，谢谢！

另外，我参考 http://www.liuzihua.org/past/2011/10/26/107_ionrubyoracleoci8/ 也是一样的结果。

我安装失败日志如下：

$ gem install ruby-oci8
Building native extensions.  This could take a while...
ERROR:  Error installing ruby-oci8:
    ERROR: Failed to build gem native extension.

        /Users/wenke/.rvm/rubies/ree-1.8.7-2012.02/bin/ruby extconf.rb
checking for load library path... 
  DYLD_LIBRARY_PATH... 
    checking /opt/oracle/instantclient_10_2-32bit...   skip: /opt/oracle/instantclient_10_2-32bit/libclntsh.dylib.10.1 is for i386 cpu.
checking for cc... ok
checking for gcc... yes
checking for LP64... yes
checking for sys/types.h... yes
checking for ruby header... ok
Get the version of Oracle from SQL*Plus... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/Users/wenke/.rvm/rubies/ree-1.8.7-2012.02/bin/ruby
    --with-instant-client
    --without-instant-client
./oraconf.rb:758:in `get_version': RuntimeError (RuntimeError)
    from ./oraconf.rb:707:in `initialize'
    from ./oraconf.rb:319:in `new'
    from ./oraconf.rb:319:in `get'
    from extconf.rb:18
---------------------------------------------------
Error Message:
  cannot get Oracle version from sqlplus
Backtrace:
  ./oraconf.rb:758:in `get_version'
  ./oraconf.rb:707:in `initialize'
  ./oraconf.rb:319:in `new'
  ./oraconf.rb:319:in `get'
  extconf.rb:18
---------------------------------------------------
See:
 * http://ruby-oci8.rubyforge.org/en/HowToInstall.html
 * http://ruby-oci8.rubyforge.org/en/ReportInstallProblem.html



Gem files will remain installed in /Users/wenke/.rvm/gems/ree-1.8.7-2012.02/gems/ruby-oci8-2.1.2 for inspection.
Results logged to /Users/wenke/.rvm/gems/ree-1.8.7-2012.02/gems/ruby-oci8-2.1.2/ext/oci8/gem_make.out