That looks to me as if the (SWIG-generated) wrapper for that library is not what your C compiler expects it to be, but that's unfortunately outside of my expertise. There also is no ActiveState build of that module, but the README distributed with Lab::VISA points out a PPM maintained by the author.

In reply to Re^5: Install Module from CPAN by Corion
in thread Install Module from CPAN by Bintuch

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