This doesn't work on Mac OS X since

some of the error messages are different.

However, the following modification works on Mac OS X.

$_=++$_*++$_*++$_;($:)=($!=$*=$~=--$_)=~/^(.).*$/;--$*;$*--;$;=$:;($:)
+=($!=$_+=++$_)=~/^(.).*$/;--$*;$*--;$;=$;.$:;$_++;$_++;($:)=($!=++$_)
+=~/^(.).*$/;--$*;$*--;$;=$;.$:;--$_;--$_;($:)=($!=$_+=++$_-(++$~))=~/
+^(.)/;$;=$;.$:;$_+=++$~;($:,$~)=($!=$_+=$~)=~/^...(.)(.).*$/;$,=$:.$~
+;($:,$~)=($!=--$_)=~/^.* (.)(.).*$/;$,.=$:.$~;$_/=$_;$|=$_++;`$, $; $
+|>&$_`
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