localhost ~ # emerge digikam --pretend

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

Calculating dependencies... done!
[ebuild  N    ] media-libs/libgphoto2-2.4.0-r1  USE="hal nls -doc -exif" CAMERAS
="-adc65 -agfa_cl20 -aox -barbie -canon -casio_qv -clicksmart310 -digigr8 -digit
a -dimagev -dimera3500 -directory -enigma13 -fuji -gsmart300 -hp215 -iclick -jam
cam -jd11 -kodak_dc120 -kodak_dc210 -kodak_dc240 -kodak_dc3200 -kodak_ez200 -kon
ica -konica_qm150 -largan -lg_gsm -mars -mustek -panasonic_coolshot -panasonic_d
c1000 -panasonic_dc1580 -panasonic_l859 -pccam300 -pccam600 -polaroid_pdc320 -po
laroid_pdc640 -polaroid_pdc700 -ptp2 -ricoh -ricoh_g3 -samsung -sierra -sipix_bl
ink -sipix_blink2 -sipix_web2 -smal -sonix -sony_dscf1 -sony_dscf55 -soundvision
 -spca50x -sq905 -stv0674 -stv0680 -sx330z -template -toshiba_pdrm11"
[ebuild     U ] kde-base/kdelibs-3.5.8-r3 [3.5.7-r10] USE="-arts* -bindist% -bra                                                                                                                              nding% -fam* -spell*"
[ebuild  N    ] media-gfx/dcraw-8.73  USE="-gimp"
[ebuild  N    ] media-libs/libkipi-0.1.5  USE="kdehiddenvisibility xinerama -art                                                                                                                              s -debug"
[ebuild  N    ] dev-db/sqlite-3.4.1  USE="-debug -doc -nothreadsafe -soundex -tc                                                                                                                              l"
[ebuild  N    ] media-gfx/exiv2-0.16  USE="nls unicode zlib -doc -examples -xmp"                                                                                                                               LINGUAS="-de -es -fi -fr -pl -ru"
[ebuild  N    ] media-libs/libkdcraw-0.1.3  USE="xinerama -arts -debug"
[ebuild  N    ] media-libs/libkexiv2-0.1.6  USE="xinerama -arts -debug"
[ebuild  N    ] kde-base/kamera-3.5.8  USE="kdeenablefinal xinerama -arts -debug                                                                                                                              "
[ebuild  N    ] kde-base/kgamma-3.5.8  USE="kdeenablefinal xinerama -arts -debug                                                                                                                              "
[ebuild  N    ] media-gfx/digikam-0.9.3  USE="kdeenablefinal kdehiddenvisibility                                                                                                                               xinerama -arts -debug -doc -nfs" LINGUAS="-ar -bg -br -ca -cs -cy -da -de -el -                                                                                                                              en_GB -es -et -fa -fi -fr -gl -he -hu -is -it -ja -ka -lt -mk -ms -mt -nb -nds -                                                                                                                              nl -nn -pa -pl -pt -pt_BR -ro -ru -rw -sk -sl -sr -sr@Latn -sv -ta -th -tr -uk -                                                                                                                              vi -zh_CN -zh_TW"
[blocks B     ] <sys-fs/udev-114 (is blocking media-libs/libgphoto2-2.4.0-r1)
localhost ~ # emerge --pretend
emerge: the other white meat (command-line interface to the Portage system)