Wpa supplicant/Setup for dhcpcd as network manager
From Gentoo Wiki
emerge --ask net-wireless/wpa_supplicant
Complete its conf.d file with the
-M option for the wireless network interface:
wpa_supplicant_args="-B -M -c/etc/wpa_supplicant/wpa_supplicant.conf"
In case authentication for the wired interface is needed this configuration file should look like
wpa_supplicant_args="-ieth0 -Dwired -c/etc/wpa_supplicant/wpa_supplicant_wired.conf -B -M -c/etc/wpa_supplicant/wpa_supplicant.conf"
With the configuration done, run it as a service:
rc-update add wpa_supplicant default
rc-service wpa_supplicant start