$ tce-load -i compiletc perl5 bash ncursesw-dev bc glibc_apps elfutils-dev git
$ cd $HOME/Downloads
$ git clone https://git.zx2c4.com/wireguard-linux-compat
$ wget http://tinycorelinux.net/10.x/x86/release/src/kernel/linux-4.19.10-patched.txz
$ wget http://tinycorelinux.net/10.x/x86/release/src/kernel/config-4.19.10-tinycore
$ tar -xvf linux-4.19.10-patched.txz
$ cd linux-4.19.10
$ cp $HOME/Downloads/config-4.19.10-tinycore .config
$ $HOME/Downloads/wireguard-linux-compat/kernel-tree-scripts/jury-rig.sh $HOME/Downloads/linux-4.19.10
$ make oldconfig
-> when asked about CONFIG_WIREGUARD choose M, when asked about CONFIG_WIREGUARD_DEBUG choose as you like (I went with y)
$ make prepare scripts
$ make M=net/wireguard modules


$ git clone https://git.zx2c4.com/wireguard-linux-compat
$ make -C wireguard-tools/src -j2
$ mkdir $HOME/Downloads/destwg
$ sudo make -C wireguard-tools/src DESTDIR=/home/bruno/Downloads/destwg install