or download this
# Here we go through a bunch of tests to decide whether we can use the
# XS module, or if we need to load and compile the perl-only
# subroutines (which are stored in __DATA__).
my $load_perlonly = 0;
$load_perlonly = 1 if defined $Time::Format::NOXS && $Time::Format:
+:NOXS;