Shadowsocks - Cannot install package gl-ss-server


I can’t install the gl-ss packages. I receive the error;
Collected errors: * satisfy_dependencies_for: Cannot satisfy the following dependencies for gl-ss-server: * libev * libsodium * *

Details of device;
Firmware Version OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.196.56128-9112198)
Kernel Version 4.9.120

Which model and which firmware version?

AR300M. It’s the latest GUI version (3.x).

I got it installed - I had to install the libsodium package first.