Building JNA for OpenBSD

This recipe was used to build the OpenBSD native library for OpenBSD. It uses the recipe for JNA.

fetch install ISO from https://www.openbsd.org/faq/faq4.html#Download
use a qemu setup with:
- a NAT network interface
- a Hostonly interface
- USB keyboard (PS2 does not work in install shell)
- min. 10 GB size
- min. 4 GB RAM
disable DNS for hostonly:
```
interface em1 {
  dns ignore;
}
```

fetch ports: https://www.openbsd.org/faq/ports/ports.html

bash

cd /tmp
ftp https://cdn.openbsd.org/pub/OpenBSD/$(uname -r)/{ports.tar.gz,SHA256.sig}
signify -Cp /etc/signify/openbsd-$(uname -r | cut -c 1,3)-base.pub -x SHA256.sig ports.tar.gz
cd /usr
tar xzf /tmp/ports.tar.gz
rm /tmp/ports.tar.gz

run make in /usr/ports/java/jna`. The resulting binary can be found in usr/ports/pobj/jna-BRANCH/jna-BRANCH/build/openbsd-ARCH.jar