On 12 Nov, William Kenworthy wrote: > On Thu, 2009-11-12 at 12:39 +0100, Helmut Jarausch wrote: >> On 12 Nov, Alan McKinnon wrote: >> > On Thursday 12 November 2009 13:05:29 Helmut Jarausch wrote: >> >> Sorry if this is FAQ but I couldn't find the answer. >> >> E.g. I have to versions of dev-libs/libusb installed, one in slot 0 and >> >> the other one in slot 1. >> >> For testing purposes I'd like to make the slot-0 version 'effective'. >> >> How can I do that (other than unmerging the slot-1 version) >> >> ASAIK, eselect cannot do this. >> > >> > >> > Why do you want to do that? The package contains only libs, and apps that >> > link >> > to it already know which on they want. >> > >> > I suppose you could tinker with LDPATH but I think there's a basic >> > misunderstanding of what the package is >> > >> >> The reason is the following bug. >> To use an old printer (no USB connector) I've purchased >> a USB-to-parallel adapater (since some software like VirtualBox >> cannot handle the parallel port). >> >> [my bug report 291596] : >> >> When I use 'add printer' from the cups web interface this "printer" isn't >> shown and I get the following entry in /var/log/messages: >> Nov 2 16:19:41 numa-be kernel: usb[9750]: segfault at 7fff14c30000 ip >> 00007f8d3a50dc0b sp 00007fff14c2ced8 error 4 in >> libc-2.10.1.so[7f8d3a490000+14d000] >> >> I have started cupsd in foreground but it doesn't show any errors. >> Where does this error come from? >> >> ----- >> >> Robin Johnson replied >> Did this work on: >> - a previous kernel? >> - the libusb-0* series? >> - ever (what changed since then)? >> >> Therefore I'd like to test with the older libusb. >> >> Many thanks for your help, >> Helmut. >> > > Just a thought as I have not been following the thread - why not use a > network printer? If its gentoo in a virtualbox on a windows machine you > can share the windows printer and use cups on the linux side to redirect > to it via samba. No need to worry about parallel ports or physical > printer connections in the vm, and the original host can continue to use > the printer on the parallel port. > > http://www.gentoo.org/doc/en/printing-howto.xml >
There are 2 reasons. First, for my PC at home, I don't have a local network and my old printer cannot be connected to a network. Here, at our institute, we have some small (old) printers within a small office (in addition to copiers connected by TCP/IP) Helmut. -- Helmut Jarausch Lehrstuhl fuer Numerische Mathematik RWTH - Aachen University D 52056 Aachen, Germany
