Synchronet v3.19b-Win32 (install) has been released (Jan-2022).

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talk:install:nix:prerequisites

Raspberry Pi2 Install gmake missing, fixed with sudo ln -s /usr/bin/make /usr/bin/gmake

– That's covered under the “gmake or make” bit. Just replace “gmake” with “make” in all the commands and everything will work fine.