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Interesting and useful tips on dealing with the dusky margins that overlap 32 and 64 bits...
To run a dynamically-linked 32-bit binary application, any libraries it needs must also be available in the 32-bit instruction set. Also, any libraries those libraries are dynamically linked against need to be available in that form, right down to the C library itself (such as glibc on GNU systems).
So, to run 32-bit programs on a 64-bit system, two flavors of the C library (and more libraries besides) need to be provided by the operating system, and these extra libraries need to reside somewhere in the file system. Multiple instances of a particular library, each for a different instruction set supported by the processor, is often known as multilib.
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