On Mon, Jan 14, 2013 at 05:04:35PM +0530, Yohan Pereira wrote: > On 14/01/13 at 11:18am, Alan Mackenzie wrote: > > Hi, Gentoo.
> > Would somebody please help me with this error message, which arose from > > # emerge -puND world > > : > > These are the packages that would be merged, in order: > > Calculating dependencies \ > > !!! Problem resolving dependencies for media-gfx/sane-backends from > > @selected > > ... done! > > !!! The ebuild selected to satisfy "media-gfx/sane-backends" has unmet > > requirements. > > - media-gfx/sane-backends-1.0.23::gentoo USE="ipv6 (multilib) usb -avahi > > -doc -gphoto2 -threads -v4l -xinetd" SANE_BACKENDS="abaton agfafocus apple > > artec artec_eplus48u as6e avision bh canon canon630u canon_dr canon_pp > > cardscan coolscan coolscan2 coolscan3 dc210 dc240 dc25 dell1600n_net dmc > > epjitsu epson epson2 fujitsu genesys gt68xx hp hp3500 hp3900 hp4200 hp5400 > > hp5590 hpljm1005 hpsj5s hs2p (ibm) kodak kodakaio kvs1025 kvs20xx kvs40xx > > leo lexmark ma1509 magicolor matsushita microtek microtek2 mustek mustek_pp > > mustek_usb mustek_usb2 nec net niash p5 pie pixma plustek plustek_pp qcam > > ricoh rts8891 s9036 sceptre sharp sm3600 sm3840 snapscan sp15c st400 stv680 > > tamarack teco1 teco2 teco3 test u12 umax umax1220u umax_pp xerox_mfp -pnm" > > The following REQUIRED_USE flag constraints are unsatisfied: > > <============================================= > > sane_backends_mustek_usb2? ( threads ) sane_backends_kvs40xx? ( threads > > ) > > (dependency required by "@selected" [set]) > > (dependency required by "@world" [argument]) > > ######################################################################## > > I'm mystified as to what a "REQUIRED_USE flag constraint" is. What is > > the significance of "sane_backends_mustek_usb2"? It would appear not to > > be a use flag. What is the significance of "( threads )"? > Bassicly its emerge is telling you that if you have > sane_backends_mustek_usb2 enabled you also need to enable threads and > similarly if you have sane_backends_kvs40xx enabled you need to enable > threads. So in your case you need to enable threads or disable those 2 > backends. Ah, it looks so obvious now. ;-) Thanks! Another question - is there any sensible way of cutting the unnecessary stuff out of SANE_BACKENDS? That variable is set in the ebuild, and it doesn't feel the Right Thing to edit the ebuild file. > -- > - Yohan Pereira -- Alan Mackenzie (Nuremberg, Germany).
