Make this work on Perl 5.005.03 (ala RELENG_4) by installing

the bytes.pm pragma, which is the only thing that the new
version of Net::DNS needs from 5.6+ that isn't in 5.005.03.

dns/p5-Net-DNS/Makefile

@@ -46,10 +46,20 @@ MAN3=		Net::DNS.3 Net::DNS::Header.3 Net::DNS::Packet.3 \
 
 .if ${PERL_LEVEL} < 500800
 RUN_DEPENDS+=	${SITE_PERL}/${PERL_ARCH}/MIME/Base64.pm:${PORTSDIR}/converters/p5-MIME-Base64
+RUN_DEPENDS+=	${SITE_PERL}/IO/Socket/INET6.pm:${PORTSDIR}/net/p5-IO-INET6
+PLIST_SUB+=	BYTES_INSTALL=""
+.else
+PLIST_SUB+=	BYTES_INSTALL="@comment "
 .endif
 
 DOCSDIR=	${PREFIX}/share/doc/p5-Net-DNS
+
 post-install:
+.if ${PERL_LEVEL} < 500800
+.for file in bytes.pm bytes_heavy.pl
+	${INSTALL_DATA} ${FILESDIR}/${file} ${SITE_PERL}
+.endfor
+.endif
 .if !defined(NOPORTDOCS)
 	@${MKDIR} ${DOCSDIR}
 .for doc in Changes README TODO

dns/p5-Net-DNS/files/bytes.pm

@@ -0,0 +1,91 @@
+# This is the file from Perl 5.8.7, installed
+# by the p5-Net-DNS module for Perl < 5.6.
+
+package bytes;
+
+#our $VERSION = '1.02';
+
+$bytes::hint_bits = 0x00000008;
+
+sub import {
+    $^H |= $bytes::hint_bits;
+}
+
+sub unimport {
+    $^H &= ~$bytes::hint_bits;
+}
+
+sub AUTOLOAD {
+    require "bytes_heavy.pl";
+    goto &$AUTOLOAD if defined &$AUTOLOAD;
+    require Carp;
+    Carp::croak("Undefined subroutine $AUTOLOAD called");
+}
+
+sub length ($);
+sub chr ($);
+sub ord ($);
+sub substr ($$;$$);
+sub index ($$;$);
+sub rindex ($$;$);
+
+1;
+__END__
+
+=head1 NAME
+
+bytes - Perl pragma to force byte semantics rather than character semantics
+
+=head1 SYNOPSIS
+
+    use bytes;
+    ... chr(...);       # or bytes::chr
+    ... index(...);     # or bytes::index
+    ... length(...);    # or bytes::length
+    ... ord(...);       # or bytes::ord
+    ... rindex(...);    # or bytes::rindex
+    ... substr(...);    # or bytes::substr
+    no bytes;
+
+
+=head1 DESCRIPTION
+
+The C<use bytes> pragma disables character semantics for the rest of the
+lexical scope in which it appears.  C<no bytes> can be used to reverse
+the effect of C<use bytes> within the current lexical scope.
+
+Perl normally assumes character semantics in the presence of character
+data (i.e. data that has come from a source that has been marked as
+being of a particular character encoding). When C<use bytes> is in
+effect, the encoding is temporarily ignored, and each string is treated
+as a series of bytes. 
+
+As an example, when Perl sees C<$x = chr(400)>, it encodes the character
+in UTF-8 and stores it in $x. Then it is marked as character data, so,
+for instance, C<length $x> returns C<1>. However, in the scope of the
+C<bytes> pragma, $x is treated as a series of bytes - the bytes that make
+up the UTF8 encoding - and C<length $x> returns C<2>:
+
+    $x = chr(400);
+    print "Length is ", length $x, "\n";     # "Length is 1"
+    printf "Contents are %vd\n", $x;         # "Contents are 400"
+    { 
+        use bytes; # or "require bytes; bytes::length()"
+        print "Length is ", length $x, "\n"; # "Length is 2"
+        printf "Contents are %vd\n", $x;     # "Contents are 198.144"
+    }
+
+chr(), ord(), substr(), index() and rindex() behave similarly.
+
+For more on the implications and differences between character
+semantics and byte semantics, see L<perluniintro> and L<perlunicode>.
+
+=head1 LIMITATIONS
+
+bytes::substr() does not work as an lvalue().
+
+=head1 SEE ALSO
+
+L<perluniintro>, L<perlunicode>, L<utf8>
+
+=cut

dns/p5-Net-DNS/files/bytes_heavy.pl

@@ -0,0 +1,43 @@
+# This is the file from Perl 5.8.7, installed
+# by the p5-Net-DNS module for Perl < 5.6.
+
+package bytes;
+
+sub length ($) {
+    BEGIN { bytes::import() }
+    return CORE::length($_[0]);
+}
+
+sub substr ($$;$$) {
+    BEGIN { bytes::import() }
+    return
+	@_ == 2 ? CORE::substr($_[0], $_[1]) :
+	@_ == 3 ? CORE::substr($_[0], $_[1], $_[2]) :
+	          CORE::substr($_[0], $_[1], $_[2], $_[3]) ;
+}
+
+sub ord ($) {
+    BEGIN { bytes::import() }
+    return CORE::ord($_[0]);
+}
+
+sub chr ($) {
+    BEGIN { bytes::import() }
+    return CORE::chr($_[0]);
+}
+
+sub index ($$;$) {
+    BEGIN { bytes::import() }
+    return
+	@_ == 2 ? CORE::index($_[0], $_[1]) :
+	          CORE::index($_[0], $_[1], $_[2]) ;
+}
+
+sub rindex ($$;$) {
+    BEGIN { bytes::import() }
+    return
+	@_ == 2 ? CORE::rindex($_[0], $_[1]) :
+	          CORE::rindex($_[0], $_[1], $_[2]) ;
+}
+
+1;

dns/p5-Net-DNS/pkg-plist

@@ -1,3 +1,5 @@
+%%BYTES_INSTALL%%%%SITE_PERL%%/bytes.pm
+%%BYTES_INSTALL%%%%SITE_PERL%%/bytes_heavy.pl
 %%SITE_PERL%%/%%PERL_ARCH%%/Net/DNS.pm
 %%SITE_PERL%%/%%PERL_ARCH%%/Net/DNS/FAQ.pod
 %%SITE_PERL%%/%%PERL_ARCH%%/Net/DNS/Header.pm