Perl : PAR打包报错 Subroutine import redefined at POSIX.pm line xxx

1、用pp将xs.pl打包成xs.exe：
pp -o xs.exe -M PerlIO -M PerlIO::scalar xs.pl
运行xs.exe出错：

Subroutine import redefined at POSIX.pm line 21.
Subroutine croak redefined at POSIX.pm line 29.
Subroutine AUTOLOAD redefined at POSIX.pm line 39.
Subroutine DESTROY redefined at POSIX.pm line 80.
Novel/4Ytyc.pm did not return a true value at script/xs.pl line 15.
BEGIN failed--compilation aborted at script/xs.pl line 15.

2、加-M POSIX重新生成xs1.exe：

pp -o xs1.exe -M PerlIO -M PerlIO::scalar -M POSIX xs.pl

此时xs1.exe可以运行，但是还会报之前的四行Subroutine xxx redefined。

3、注释掉xs.pl里面这两行：

use strict;
use warnings;

再重新生成xs2.exe：
pp -o xs2.exe -M PerlIO -M PerlIO::scalar -M POSIX xs.pl
此时xs2.exe可以正常运行，也不报Subroutine xxx redefined了。
土法炼钢。。。