That would seem like the way to go for XS modules too, as each generation is binary compatible with other versions of the same generation, but not with other generations.
As a basic rule, perl 5.x.y will know it's supposed to be binary compatable with 5.x.z, z < y, and will hence include the appropriate directories in @INC, if available at compile time. At least, 5.8.x does so (but I think 5.6.x as well). For instance: 
perl -wle '$, = "\n"; print @INC'
/home/abigail/Perl
/opt/perl/lib/5.8.3/i686-linux-64int-ld
/opt/perl/lib/5.8.3
/opt/perl/lib/site_perl/5.8.3/i686-linux-64int-ld
/opt/perl/lib/site_perl/5.8.3
/opt/perl/lib/site_perl/5.8.2/i686-linux-64int-ld
/opt/perl/lib/site_perl/5.8.2
/opt/perl/lib/site_perl/5.8.1/i686-linux-64int-ld
/opt/perl/lib/site_perl/5.8.1
/opt/perl/lib/site_perl/5.8.0
/opt/perl/lib/site_perl
.

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Abigail

In reply to Re: Modules that differ for different Perl generations by Abigail-II
in thread Modules that differ for different Perl generations by bart

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