Install
Since pprolog has zero dependencies other than what is available by default on 9front it is pretty easy to install.
If you have git9 installed the steps are:
git/clone https://git.sr.ht/~pmikkelsen/pprolog
cd pprolog
mk install
This will install the pprolog binary to /$objtype/bin, so you may want to modify BIN in the mkfile to install to somewhere else like $home/bin/$objtype/
It will also install the prolog libraries to /sys/lib/prolog and this is hardcoded in the mkfile and in dat.h if you want to change that.