From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id 4BE49138480 for ; Mon, 14 Jan 2013 11:25:56 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 7BC9921C0DD; Mon, 14 Jan 2013 11:25:42 +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 81E3C21C06D for ; Mon, 14 Jan 2013 11:25:40 +0000 (UTC) Received: (qmail 52565 invoked by uid 3782); 14 Jan 2013 11:25:38 -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 12:25:37 +0100 Received: (qmail 3284 invoked by uid 1000); 14 Jan 2013 11:18:52 -0000 Date: Mon, 14 Jan 2013 11:18:52 +0000 To: gentoo-user@lists.gentoo.org Subject: [gentoo-user] Too terse error message from emerge. Message-ID: <20130114111852.GA3274@acm.acm> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail 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 User-Agent: Mutt/1.5.21 (2010-09-15) X-Delivery-Agent: TMDA/1.1.12 (Macallan) From: Alan Mackenzie X-Primary-Address: acm@muc.de X-Archives-Salt: eedc1117-c31c-4c7e-8515-a7f036118c57 X-Archives-Hash: 4c3535c1d18c0dbf54534732e15862e5 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 )"? Any other helpful comments appreciated. -- Alan Mackenzie (Nuremberg, Germany).