Okay I installed the commands:
sudo apt-get install build-essential zlib1g-dev libsdl1.2-dev libsdl2-dev libjpeg-dev \
nasm tar libbz2-dev libgtk2.0-dev cmake git libfluidsynth-dev libgme-dev \
libopenal-dev timidity libgl1-mesa-dev libglew-dev
However the rest of the instructions on that page were a little confusing, so I did some more research.
How would I uninstall those programs? I'm not having any issues but I don't think I need them now.
What I found was on the Linux Mint forums (nice distro but not as Nvidia friendly as Zorin is!)
https://forums.linuxmint.com/viewtopic.php?f=225&t=221017&sid=d5846514ad65f9b3df70d9f3830713f1I used these commands the forum suggested:
sudo apt-add-repository 'deb
http://debian.drdteam.org/ stable multiverse'
wget -O -
http://debian.drdteam.org/drdteam.gpg | sudo apt-key add -
sudo apt-get update
sudo apt-get install gzdoom
Those commands installed Gzdoom in my 'opt' folder, for some reason I couldn't run the program or even copy the wad files I needed into that folder in the first place. However when I copied the Gzdoom folder to my desktop, I was able to run it just fine (works great!). Any idea what is causing that issue? I'm suspecting it has to do with folder permissions.
Edit: If you're into quake-I've found Quake Epsilon works great!
http://www.moddb.com/mods/quake-epsilon-build/downloads/quake-epsilon-build-v252