built-in apache server with mod_rpaf compile error

 OpenBSD 5.1-stable (GENERIC.MP) #0: Sat May 26 19:25:48 CST 2012
amd64 wget http://stderr.net/apache/rpaf/download/mod_rpaf-0.6.tar.gz
tar zxvf mod_rpaf-0.6.tar.gz
cd mod_rpaf-0.6
# /usr/sbin/apxs -i -c -n mod_rpaf.so mod_rpaf.c
cc -O2 -pipe -DINET6 -Dss_family=__ss_family -Dss_len=__ss_len
-DHAVE_SOCKADDR_LEN -DMOD_SSL=208116 -DEAPI -DUSE_SETUSERCONTEXT -fPIC
-DSHARED_MODULE -I/usr/lib/apache/include  -c mod_rpaf.c
mod_rpaf.c: In function 'rpaf_cleanup':
mod_rpaf.c:151: error: 'struct sockaddr_storage' has no member named
'sin_addr'
mod_rpaf.c: In function 'change_remote_ip':
mod_rpaf.c:186: error: 'struct sockaddr_storage' has no member named
'sin_addr'
apxs:Break: Command failed with rc=1
# httpd -v
Server version: Apache/1.3.29 (Unix)
each version  mod_rpaf   has the same  error how to repire it ?