[Mailman-Users] Postfix and Mailman tips in FAQ have a mistake?

[Konstantin Vasilyev]

Hillo,

I try to integrate my Postfix with Mailman.
I use tip from FAQ here http://wiki.list.org/x/ZoCj
I have  error message
bin/genaliases
sed: illegal option -- r
usage: sed script [-Ealn] [-i extension] [file ...]
       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ...
[file ...]
I remove '-r' and try again.
result here
 bin/genaliases
sed: 1: "s/(^[^#][^ \t]+[ \t]+). ...": \1 not defined in the RE

I am not expert in sed. Can anyone help me?

PS. Sorry for my English.