These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.11 s (backtrack: 0/20).

[ebuild  N     ] acct-group/plugdev-0-r3::gentoo  0 KiB
[ebuild  N     ] media-libs/libexif-0.6.26::gentoo  USE="nls -doc -verify-sig" 1305 KiB
[ebuild  N     ] media-libs/aalib-1.4_rc5-r11::gentoo  USE="X gpm -slang" 382 KiB
[ebuild  N     ] dev-libs/cdk-5.0.20260119:0/6.3.5::gentoo  USE="unicode -examples -verify-sig" 542 KiB
[ebuild  N     ] dev-libs/libusb-1.0.30:1::gentoo  USE="-debug -doc -examples -static-libs -test -udev -verify-sig" 641 KiB
[ebuild  N     ] virtual/libusb-1-r2:1::gentoo  USE="-udev" 0 KiB
[ebuild  N     ] media-libs/libgphoto2-2.5.34-r1:0/6::gentoo  USE="exif jpeg nls tiff -doc -examples -gd -serial -verify-sig" CAMERAS="adc65 agfa_cl20 aox ax203 barbie canon casio_qv clicksmart310 digigr8 digita dimagev dimera3500 directory enigma13 fuji gsmart300 hp215 iclick jamcam jd11 jl2005a jl2005c kodak_dc120 kodak_dc210 kodak_dc240 kodak_dc3200 kodak_ez200 konica konica_qm150 largan lg_gsm mars mustek panasonic_coolshot panasonic_dc1000 panasonic_dc1580 panasonic_l859 pccam300 pccam600 pentax polaroid_pdc320 polaroid_pdc640 polaroid_pdc700 ptp2 ricoh ricoh_g3 samsung sierra sipix_blink2 sipix_web2 smal sonix sony_dscf1 sony_dscf55 soundvision spca50x sq905 st2205 stv0674 stv0680 sx330z topfield toshiba_pdrm11 tp6801" 6921 KiB
[ebuild  N     ] media-gfx/gphoto2-2.5.28-r2::gentoo  USE="aalib ncurses nls readline" 563 KiB

Total: 8 packages (8 new), Size of downloads: 10351 KiB

The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by media-gfx/gphoto2-2.5.28-r2::gentoo
# required by =media-gfx/gphoto2-2.5.28-r2 (argument)
>=media-libs/libgphoto2-2.5.34-r1 exif