data/sprites/rock%.png: rocks.pov gfx.mk
povray -Irocks.pov -D +H52 +W52 +K`echo "$@" | grep -o '[0-9][0-9]'` +Fp -O$@.pnm 2>/dev/null
pnmcrop < $@.pnm > $@-c.pnm
data/sprites/rock%.png: rocks.pov gfx.mk
povray -Irocks.pov -D +H52 +W52 +K`echo "$@" | grep -o '[0-9][0-9]'` +Fp -O$@.pnm 2>/dev/null
pnmcrop < $@.pnm > $@-c.pnm