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sane-backends spec-file intents for sane-backend to be build against libusb-1.0, as such it BuildRequires libusb1-devel for RHEL >= 7, but other BuildRequires drag in the old libusb-devel, and ./configure then decides to use that. We really don't want packages to be using the obsolete libusb-compat-0.1 in RHEL-7 when we can avoid it. Also the using of the obsolete libusb-compat-0.1 causes the scanimage tool to crash when used with various usb-scanners, see Fedora bug 1003193. Note the most recent Fedora packages also contain a fix for this.
We've rebased sane-backends to 1.0.24 in RHEL-7 -- bug #1025413, RHBA-2013:16200 -- which pulls in the fix for this as well. Closing.