From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id D56DB1396D9 for ; Wed, 1 Nov 2017 02:19:51 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id B02C82BC0E6; Wed, 1 Nov 2017 02:19:43 +0000 (UTC) Received: from mail-1.ca.inter.net (mail-1.ca.inter.net [208.85.220.69]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 6305F2BC009 for ; Wed, 1 Nov 2017 02:19:43 +0000 (UTC) Received: from localhost (offload-3.ca.inter.net [208.85.220.70]) by mail-1.ca.inter.net (Postfix) with ESMTP id D2AE92EA06E for ; Tue, 31 Oct 2017 22:19:42 -0400 (EDT) Received: from mail-1.ca.inter.net ([208.85.220.69]) by localhost (offload-3.ca.inter.net [208.85.220.70]) (amavisd-new, port 10024) with ESMTP id z3fqzZNS+ON6 for ; Tue, 31 Oct 2017 22:19:42 -0400 (EDT) Received: from ca.inter.net (host-45-58-230-101.dyn.295.ca [45.58.230.101]) by mail-1.ca.inter.net (Postfix) with SMTP id 780202EA064 for ; Tue, 31 Oct 2017 22:19:41 -0400 (EDT) Received: by ca.inter.net (sSMTP sendmail emulation); Tue, 31 Oct 2017 22:19:41 -0400 Date: Tue, 31 Oct 2017 22:19:41 -0400 From: Philip Webb To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] insane backends Message-ID: <20171101021941.GN1980@ca.inter.net> Mail-Followup-To: gentoo-user@lists.gentoo.org References: <20171030023931.GA1980@ca.inter.net> <20171030083933.23015622@digimed.co.uk> 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 In-Reply-To: <20171030083933.23015622@digimed.co.uk> User-Agent: Mutt/1.7.2 (2016-11-26) X-Archives-Salt: cf2057d9-7919-4f68-9d95-00bd43ad019c X-Archives-Hash: 249854562a38e26590e56c354c538c78 171030 Neil Bothwick wrote: > On Sun, 29 Oct 2017 22:39:31 -0400, Philip Webb wrote: >> 'sane-backends-1.0.27' just stabilised, so I updated to it. >> Previously I had selected 4 items from the list in SANE_BACKENDS, >> which is shown by 'emerge', ie 'epson epson2 plustek plustek_pp'. >> My scanner is an 'Epson V550 Photo'. >> >> Wanting to test which of the 4 items above was needed, I tried each. >> Inadvertently, I tried emerging 'sane-backends' with none included >> & discovered that my scanner still works regardless ! > ISTR that with use_expanded variables like this, > if you don't set the variable then all options are enabled, > so you've just built an un-Gentoolike version that works everywhere. That doesn't matter much beyond compile time, which is not excessive : Xsane will interrogate the scanner & when it's told it's an Epson V550 it will load the appropriate driver & go from there. >From the point of view of system maintenance, it's much simpler to let it do that than try to pick out the driver myself. > You could check this by using qlist > to see what has been installed with and without SANE_BACKENDS set. 'qlist sane-backends' doesn't show anything like that. Thanks for the explanation. -- ========================,,============================================ SUPPORT ___________//___, Philip Webb ELECTRIC /] [] [] [] [] []| Cities Centre, University of Toronto TRANSIT `-O----------O---' purslowatchassdotutorontodotca