gcc -rdynamic alien_overlay.c -shared -ldl -o fx/alien_overlay
gcc -rdynamic mirror_x.c -shared -ldl -o fx/mirror_x
gcc -rdynamic negate.c -shared -ldl -o fx/negate
gcc -rdynamic noise.c -shared -ldl -o fx/noise
gcc -rdynamic posterise.c -shared -ldl -o fx/posterise
gcc -rdynamic simple_blend.c -shared -ldl -o fx/simple_blend
gcc -rdynamic libvis.c -shared -ldl -lvisual -o fx/libvis
