Hi there! I managed to sort of compile it on my Raspberry Pi 4!
But...
When I give the program a TGA like this:
sudo Debug/noaa_apt -i in.tga -s in.tga -m C -l -d /home/pi/aptmake/apt-encoder/out.wav -r /home/pi/aptmake/apt-encoder/out.wav
I get a result like this:

and this is the audio file:
out.wav
It just doesn't sound right and the image is very corrupted...
If anyone knows what to do please let me know! I would really like to get this working!
Thx!
-Marley Hollingshead