calculate-overlay/profiles/default/package.use/any-of

# any-of ( mysql postgres sqlite )
sys-cluster/csync2 postgres

# any-of ( mysql postgres sqlite )
mail-client/roundcube sqlite

# any-of ( iptables nftables )
net-misc/connman iptables

# any-of ( emacs fcitx4 ibus )
app-i18n/mozc -ibus fcitx4

# any-of ( cgi mono perl go lua php pypy python python_asyncio python_gevent ruby )
www-servers/uwsgi python

# any-of ( java lua mono perl php python ruby tcl )
dev-libs/xapian-bindings python

# at-most-one-of ( alsa pulseaudio )
games-action/descent3-demo alsa -pulseaudio

# any-of ( mysql postgres sqlite )
mail-client/roundcube postgres -sqlite

# any-of ( perl python ruby php5-6 php7-1 php7-2 )
www-servers/nginx-unit python

# any-of ( client server )
media-plugins/vdr-streamdev server

# any-of ( gnome-keyring pass )
app-emulation/docker-credential-helpers gnome-keyring

# connection-sharing? ( any-of ( iptables nftables ) )
net-misc/networkmanager iptables