GMP was compiled 64-bit. Your Perl is 32-bit. Recompile GMP for 32-bit integers (or you can recompile perl for 64-bit). Consult GMP documentation on how to do it.

Update: The option is ABI=32, i.e., you should reconfigure GMP by 

./configure ABI=32
This yields 
gmp-4.1.2$ file .libs/libgmp.so
.libs/libgmp.so:        ELF 32-bit MSB dynamic lib SPARC32PLUS Version 1, V8+ Required,
UltraSPARC1 Extensions Required, dynamically linked, not stripped

In reply to Re: Building Net::SFTP on Solaris problem. by asarih
in thread Building Net::SFTP on Solaris problem. by Plankton

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