Synology NAS

Step 1: Check if mono is installed on your NAS.

mono -V

If you get output like below, you have mono on your device and can skip installing mono. And go directly to Step 3

Mono JIT compiler version 3.4.0 (Debian 2.10.8.1-1ubuntu2.2)
Copyright (C) 2002-2014 Novell, Inc, Xamarin, Inc and Contributors. www.mono-project.com
        TLS:           __thread
        SIGSEGV:       normal
        Notifications: epoll
        Architecture:  armel,vfp+hard
        Disabled:      none
        Misc:          softdebug
        LLVM:          supported, not enabled.
        GC:            sgen

If the output is like below, then you have to install mono on your device.

Step 2: Install mono from https://synocommunity.com

Step 3: Install and run WG++. This is the same as on the general Linux installation.
Just skip the mono part, because this you have already done in the previous steps.

Remarks:Mono is installed in /usr/local/mono/bin/mono