Just in case anyone else should follow this node;
It occurs to me that one could also create a module that "pre-pends" the desired
additional directory the system' include path, which could then become a system
wide include, by creating a wrapper for the Perl executable.
If the module name were "prepend-lib-path.pm" the "wrapper" that disguises itself as
Perl proper, would contain:
use prepend-lib-path;
While not an excuse to omit "lib" paths you might later decide you need;
it might help in a pinch.
HTH
#!/usr/bin/perl -Tw
use perl::always;
my $perl_version = "5.12.4";
print $perl_version;