s6 2.13.2
https://skarnet.org/software/s6/s6-2.13.2.0.tar.gz

``` sh *** build ***
./configure --prefix=/pkg/gnu/s6 --with-sysdeps=/pkg/gnu/skalibs/lib/skalibs/sysdeps &&
make -j$(nproc) && make install && mkdir -p /pkg/gnu/s6/etc/service
```

``` cfg *** build deps ***
skalibs
```