help me~ ! RMAN Library.

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Question is.
I'm tring to making SBT Library.
And I want to another Library with SBT Library.
Of course, SBT Library call anoter Library.
But, I found that SBT Libarary can not use with other Library.
If compiled SBT Library with anoter Library together and make one library,
libobk.so, can work.
But, If i make two library, libobk.so ane libxdr.so - for example, RMAN can
not load libobk.so.

I have to set any Environment, such as Library path..?
Help me~!