I wanted to update my system recently and found that emerge proposed me to install linuxwacom even with USE=-wacom set. Full procedure: # emerge -pv xorg-x11 These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild N ] x11-misc/linuxwacom-0.7.2 USE="gtk gtk2 usb -dlloader -sdk -tcltk" 0 kB [ebuild R ] x11-base/xorg-x11-7.0-r1 USE="-3dfx" INPUT_DEVICES="-acecad -aiptek -calcomp -citron -digitaledge -dmc -dynapro -elo2300 -elographics -evdev -fpit -hyperpen -jamstudio -joystick -keyboard -magellan -magictouch -microtouch -mouse -mutouch -palmax -penmount -spaceorb -summa -synaptics -tek4957 -ur98 -vmmouse -void -wacom" VIDEO_CARDS="nvidia -apm -ark -chips -cirrus -cyrix -dummy -fbdev -fglrx -glint -i128 -i740 -i810 -imstt -mach64% -mga -neomagic -nsc -nv -r128% -radeon% -rendition -s3 -s3virge -savage -siliconmotion -sis -sisusb -tdfx -tga -trident -tseng -v4l -vesa -vga -via -vmware -voodoo" 0 kB
When you don't set any INPUT_DEVICES, it pulls in all of them. Apparently you already have the rest of them installed. If you add INPUT_DEVICES="keyboard mouse" to make.conf, you won't have this problem.
indeed, yes ... thanks for the trick