There is no ppc64el package for libluajit-5.1-dev on Ubuntu 16.04 (or 17.10). It looks to be an older package from a previous release Ubuntu 14.04.
$ apt-get install libluajit-5.1-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libluajit-5.1-dev
E: Couldn't find any package by glob 'libluajit-5.1-dev'
E: Couldn't find any package by regex 'libluajit-5.1-dev'
There is no ppc64el package for libluajit-5.1-dev on Ubuntu 16.04 (or 17.10). It looks to be an older package from a previous release Ubuntu 14.04.
$ apt-get install libluajit-5.1-dev Reading package lists... Done Building dependency tree
Reading state information... Done E: Unable to locate package libluajit-5.1-dev E: Couldn't find any package by glob 'libluajit-5.1-dev' E: Couldn't find any package by regex 'libluajit-5.1-dev'