gphoto2 fails to buold on a system that has an older version of gphoto2 installed because its Makefiles attempt to link in the new gphoto2 executable against the system-installed libgphoto2 instead of the libgphoto2 currently building. This can be easily verified by installing for example the gphoto2-2.0 rpms and attempting a --rebuild of the current gphoto2-2.1.2 package. Not a big severity, but a timebomb waiting to blow up at some point in the future.
*** Bug 106443 has been marked as a duplicate of this bug. ***
Fixed in rawhide, not a big issue for RHEL so I'm closing it as RAWHIDE