-BEGIN {
- my $force = $ENV{PERL_AUTOVIVIFICATION_TEST_THREADS} ? 1 : !1;
- skipall 'This perl wasn\'t built to support threads'
- unless $Config{useithreads};
- skipall 'perl 5.13.4 required to test thread safety'
- unless $force or $] >= 5.013004;
-}