From pack:
The integer formats s, S , i , I , l , L , j , and J are inherently non-portable between processors and operating systems because they obey the native byteorder and endianness.
...
If you want portable packed integers you can either use the formats n , N , v , and V , or you can use the > and < modifiers. These modifiers are only available as of perl 5.9.2. See also perlport.

In reply to Re: unpack and byteorder - tests fail on certain platforms by davidrw
in thread unpack and byteorder - tests fail on certain platforms by andreas1234567

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