emerge -a dkim-milter
emerge --config mail-filter/dkim-milter

/etc/mail/dkim-filter/dkim-filter.conf:
Domain domain.tld
KeyFile /etc/mail/dkim-filter/mydkim.private
Selector mydkim
UMask 000

/var/bind/domain.tld.hosts:
mydkim._domainkey.domain.tld. IN TXT "v=DKIM1; g=*; k=rsa; p=yourkeyhere;"

/etc/postfix/main.cf:
smtpd_milters = unix:/var/run/dkim-filter/dkim-filter.sock
non_smtpd_milters = unix:/var/run/dkim-filter/dkim-filter.sock

rndc reload
postfix reload
/etc/init.d/dkim-filter start

Test by sending email to autorespond+dkim@dk.elandsys.com.

source1
source2

eix -Jc

cat $HOME/.config/user-dirs.dirs

# This file is written by xdg-user-dirs-update
# If you want to change or add directories, just edit the line you're
# interested in. All local changes will be retained on the next run
# Format is XDG_xxx_DIR="$HOME/yyy", where yyy is a shell-escaped
# homedir-relative path, or XDG_xxx_DIR="/yyy", where /yyy is an
# absolute path. No other format is supported.
#

XDG_DESKTOP_DIR="$HOME/Desktop"
XDG_DOWNLOAD_DIR="$HOME/Downloads"
XDG_TEMPLATES_DIR="$HOME/Templates"
XDG_PUBLICSHARE_DIR="$HOME/Public"
XDG_DOCUMENTS_DIR="$HOME/Documents"
XDG_MUSIC_DIR="$HOME/Music"
XDG_PICTURES_DIR="$HOME/Pictures"
XDG_VIDEOS_DIR="$HOME/Videos"