doesnt work on xfce unubntu 20.04 for me

[ghost]

I buddy! I compiled your software and tried to make it work, but it just doesnt display anything. how i could debug why isnt doing anything. it just, runs..but nothing at all..

I made a bunch of bmp from your example, place it inside a folder eample then try ./paperview example/ 3 &
just to try something..
what i am missing here?