It looks like your perl is 32-bit and you installed the 64-bit version of STAF (that's the reason for the "wrong ELF class: ELFCLASS64").

The '64' in sun4-solaris-64int stands for 64-bit integer support (i.e. compile time option USE_64_BIT_INT, not a 64-bit binary).  Try 

$ file /usr/bin/perl

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On my Solaris 10 box, I do get (for the 'system' perl, which is v5.8.4): 

/usr/bin/perl:  ELF 32-bit MSB executable SPARC Version 1, dynamically
+ linked, stripped

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archname is 

$ /usr/bin/perl -V:archname
archname='sun4-solaris-64int';

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In reply to Re^7: Not able to load module though @INC contains it by almut
in thread Not able to load module though @INC contains it by Anonymous Monk

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