>  What is the purpose of having two such identically names libraries?

To support 2 architectures, 32-bit (sparcv7) and 64-bit (sparcv9).

>   Or alternatively - which is the real one that I should be using?

Both, but the compiler automatically picks up the right one, depending on 
whether you compile with -m32 or -m64.

-- 
Eric Botcazou

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