I'd hazard a guess that XSLoader.pm is smart enough to figure out that the POSIX.so file is in the auto/POSIX directory below the directory where POSIX.pm is found. Wit this snippet of code from XSLoader.pm: 
my @modparts = split(/::/,$module);
my $modfname = $modparts[-1];

my $modpname = join('/',@modparts);
my $modlibname = (caller())[1];
my $c = @modparts;
$modlibname =~ s,[\\/][^\\/]+$,, while $c--;  # Q&D basename
my $file = "$modlibname/auto/$modpname/$modfname.$dl_dlext";

[download]
Later on it does a dl_load_file of $file, which for POSIX.pl will contain <directory containing POSIX.pm>/auto/POSIX/POSIX.so. So, if your script can find POSIX.pm, it can find POSIX.so.

This is just a naieve browsing of XSLoader and POSIX.pm code, however, so I might be wrong. You will find some salt in the monastery's kitchen :).

CU
Robartes-

In reply to Re: Finding loadable objects (script refuses to fail) by robartes
in thread Finding loadable objects (script refuses to fail) by hawtin

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