Redo Grant's changes (USE_PERL5=run, s/graph/image). No need for USE_PKGINSTALL. Align variables values.
Read dmesg(8) output (e.g. from /var/run/dmesg.boot), and output the device tree as GIF image to stdout. Usage: cat /var/run/dmesg.boot | /usr/pkg/bin/dmesg2gif | xv -