From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <gentoo-user+bounces-144453-garchives=archives.gentoo.org@lists.gentoo.org> Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id 301B413847F for <garchives@archives.gentoo.org>; Mon, 14 Jan 2013 12:17:58 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 88D2521C0ED; Mon, 14 Jan 2013 12:17:49 +0000 (UTC) Received: from mail.muc.de (colin.muc.de [193.149.48.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id A6D5521C079 for <gentoo-user@lists.gentoo.org>; Mon, 14 Jan 2013 12:17:47 +0000 (UTC) Received: (qmail 55743 invoked by uid 3782); 14 Jan 2013 12:17:46 -0000 Received: from acm.muc.de (pD951A9EE.dip.t-dialin.net [217.81.169.238]) by colin.muc.de (tmda-ofmipd) with ESMTP; Mon, 14 Jan 2013 13:17:44 +0100 Received: (qmail 3676 invoked by uid 1000); 14 Jan 2013 12:11:00 -0000 Date: Mon, 14 Jan 2013 12:10:59 +0000 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Too terse error message from emerge. Message-ID: <20130114121059.GB3274@acm.acm> References: <20130114111852.GA3274@acm.acm> <20130114113434.GA28090@dethkomp> Precedence: bulk List-Post: <mailto:gentoo-user@lists.gentoo.org> List-Help: <mailto:gentoo-user+help@lists.gentoo.org> List-Unsubscribe: <mailto:gentoo-user+unsubscribe@lists.gentoo.org> List-Subscribe: <mailto:gentoo-user+subscribe@lists.gentoo.org> List-Id: Gentoo Linux mail <gentoo-user.gentoo.org> X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130114113434.GA28090@dethkomp> User-Agent: Mutt/1.5.21 (2010-09-15) X-Delivery-Agent: TMDA/1.1.12 (Macallan) From: Alan Mackenzie <acm@muc.de> X-Primary-Address: acm@muc.de X-Archives-Salt: d93c7728-2d79-4407-ad24-ede4f85ac6ce X-Archives-Hash: 58d5e943d023f0bdb2b22db61335842f 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).