cups usb printer (Brother) on -current
So I was trying to print to a Brother MFC7420 connected via usb using the new cups in -current. I followed the same procedure I have for years, downloading the lpr driver and cupswrapper rpm packages from the Brother web site, converted them to tgz with the alien perl script using the -c -t flags, and installing the subsequent tgz's. I restarted cups, and voila my printer appeared. Only I couldn't print to it. After a lot of googling, I found that changing "DeviceURI usb:/dev/usb/lp0" to "DeviceURI file:///dev/usblp0" in /etc/cups/printers.conf made it work.
I don't know if this is specific to usb printers, brother printers or what, so I just let people know in case the have the same problem.