commands to run

wget https://github.com/madler/zlib/releases/download/v1.2.13/zlib-1.2.13.tar.gz
tar xvf zlib-1.2.13.tar.gz
rm zlib-1.2.13.tar.gz
mv zlib-1.2.13 zlib
mv zlib lib/zlib
git clone https://github.com/yuzudev/websocket.zig.git ./lib/websocket.zig/
git clone https://github.com/yuzudev/zig-tls12 ./lib/zig-tls12/
git clone https://github.com/jetzig-framework/zmpl.git ./lib/zmpl/

or simply run ./install.sh