nec - SANE_BACKENDS setting for building the nec backend
net - SANE_BACKENDS setting for building the net backend
niash - SANE_BACKENDS setting for building the niash backend
-nothing - SANE_BACKENDS setting if you want no backend at all
p5 - SANE_BACKENDS setting for building the p5 backend
pie - SANE_BACKENDS setting for building the pie backend
-pint - SANE_BACKENDS setting for building the pint backend
pixma - SANE_BACKENDS setting for building the pixma backend
plustek - SANE_BACKENDS setting for building the plustek backend
plustek_pp - SANE_BACKENDS setting for building the plustek_pp backend