As you might know, FreeBSD is also running on IBM POWER8 processor.
I just installed FreeBSD 11.0 on a VM, and installed NGINX. At this moment, FreeBSD does not have the pkg infrastructure for powerpc64, so, you need to use the ports infrastructure to install any software.
I tested it and everything I tried to build (git, zsh, vim, etc) worked fine.
This is the receipt on how to install NGINX after you install the base image:
# portsnap fetch # portsnap update # cd /usr/ports/www/ngninx # make install clean
After that, NGINX will be installed on your system, and you could enable it adding the following line to /etc/rc.conf: