# emerge -pqv '=media-gfx/sane-backends-1.0.31::gentoo'
[ebuild     U ] media-gfx/sane-backends-1.0.31 [1.0.30-r2] USE="threads usb v4l zeroconf -gphoto2 -ipv6 -snmp -systemd -xinetd" ABI_X86="32 (64) (-x32)" SANE_BACKENDS="abaton agfafocus apple artec artec_eplus48u as6e avision bh canon canon630u canon_dr canon_lide70%* cardscan coolscan coolscan2 coolscan3 dc210 dc240 dc25 dell1600n_net dmc epjitsu epson epson2 escl fujitsu genesys gt68xx hp hp3500 hp3900 hp4200 hp5400 hp5590 hpljm1005 hs2p ibm kodak kodakaio kvs1025 kvs20xx leo lexmark ma1509 magicolor matsushita microtek microtek2 mustek mustek_usb nec net niash p5 pie pieusb%* pixma plustek plustek_pp qcam ricoh ricoh2 rts8891 s9036 sceptre sharp sm3600 sm3840 snapscan sp15c st400 stv680 tamarack teco1 teco2 teco3 test u12 umax umax1220u umax_pp xerox_mfp -canon_pp -hpsj5s -kvs40xx -mustek_pp -mustek_usb2 -pnm"