$ find /usr -type f -name 'RSS.pm' -print 2>/dev/null
/usr/share/perl5/XML/Feed/Entry/Format/RSS.pm
/usr/share/perl5/XML/Feed/Format/RSS.pm
/usr/local/share/perl/5.34.0/XML/RSS.pm

$ perl -e 'print join("\n",sort @INC),"\n";' 
/etc/perl
/usr/lib/x86_64-linux-gnu/perl-base
/usr/lib/x86_64-linux-gnu/perl/5.34
/usr/lib/x86_64-linux-gnu/perl5/5.34
/usr/local/lib/site_perl
/usr/local/lib/x86_64-linux-gnu/perl/5.34.0
/usr/local/share/perl/5.34.0
/usr/share/perl/5.34
/usr/share/perl5