This may not be a very large concern, but the new headers_install.pl and headers_check.pl scripts do not work with versions of Perl < 5.6.0. This is largely to do with syntax changes in that version. Previously, open() only allowed two arguments. The following patch (against 22.214.171.124) alters the syntax to be backwards compatible with earlier versions. It has been tested on 5.005_03, and 5.8.8.
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diff -Naur linux-126.96.36.199.orig/scripts/headers_check.pl linux-188.8.131.52/scripts/headers_check.pl
--- linux-184.108.40.206.orig/scripts/headers_check.pl Wed Oct 15 19:02:53 2008
+++ linux-220.127.116.11/scripts/headers_check.pl Thu Oct 16 19:10:37 2008