Apache 2.4, mod_perl 2.0.9, APR::SockAddr->port() missing ?

Hi.

Apologies to Steve and Torsten for posting this previously to them directly.
It somehow slipped my mind that this would have been a better place.
Anyway thus :

I am in the process of converting some mod_perl AAA code from Apache 2.2 to 2.4, and I 
encounter the following problem :

Apache error log :

Can't locate object method "port" via package "APR::SockAddr" at 
/home/mira/EFS/lib/AUTH/SLC.pm line 1184.\

which corresponds to :

1183:	my $client_addr = $r->connection->client_addr;
1184:	$remote_port = $client_addr->port;

In the Apache 2.2 version, this was :

    $remote_port = $r->connection->remote_addr->port;

and worked fine.

Environment :

Linux d1s008 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) x86_64 
GNU/Linux (Debian "Jessie" as far as I know)

Apache/2.4.10 (Debian) mod_apreq2-20090110/2.8.0 mod_perl/2.0.9dev Perl/v5.20.2 configured 
-- resuming normal operations
(apache2 and mod_perl are the standard Debian Jessie apt-get packages)


I have tried to find clues on the WWW, CPAN etc.. but I do not find anything about 
APR::SockAddr::port(), except this snippet (quite old..) :

CPAN :
mod_perl 2.10 Changes :
...
1.99_14 - May 21, 2004

     APR::SockAddr::port() accessor is now read-only [Stas]

Also on the host, the APR::SockAddr module source :

/usr/lib/x86_64-linux-gnu/perl5/5.20/APR/SockAddr.pm :

quote
=item obj: C<$sock_addr>
( C<L<APR::SockAddr object|docs::2.0::api::APR::SockAddr>> )

=item ret: C<$port> ( integer )

=item since: 2.0.00
unquote

.. seems to imply that this should work.
(And so do
https://metacpan.org/pod/APR::SockAddr#port
http://perl.apache.org/docs/2.0/api/APR/SockAddr.html#C_port_
)

Am I doing something wrong ?

More importantly to me right now : how can I get the client's connection port number, 
possibly using a workaround ? I am in control of the Apache httpd configuration.

I do not really care if this is the real client port, or a port of some intermediate 
proxy, as long as it remains consistent across severall KeepAlive calls of the same client 
workstation.
I need this port number to forward to another module (of which I do not have the source), 
which uses this (and the remote IP), as a kind of persistent identifier for the client 
connection (for Windows WIA authentication).

The only way I can think of right now, would be to add a request header at the httpd level 
with the remote client IP:port, and then retrieve and decode that same header in my AAA 
module. But that seems a bit convoluted and heavy-handed.
Is there a way in a PerlAuthenHandler to retrieve an "Apache environment variable" 
directly, which would have been set like so ?

RewriteRule .* - [E=INFO_REMOTE_ADDR:"%{REMOTE_ADDR}\:%{REMOTE_PORT}",NE]


Thanks in advance
André Warnier