How to find out what libraries a binary calls?

Hi guys. The same binary on two different machines produces two
different results. One machine is an x86_64 and another is an i586.

My previous tests with the same CPUs and binaries produced identical
results. The only difference is that now my x86_64 had an upgrade from
SuSE 9.2 to SuSE 10.0, and in the process I installed a few different
libraries. Some were done through YaST, some were just copied over from
a 32-bit machine to /usr/lib (when I couldn't find the appropriate
library on the SuSE CD)

For now, I'm guessing it is a library problem but I can't remember what
library I copied over in such an ad hoc manner.

Is there a way for me to tell what library a binary calls?

Thanks.

.

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