Description of problem: libibverbs-1.0.3-1.fc6 requires libsysfs.so.1 which is no longer in Fedora Core 6 development. Please upgrade to libsysfs-devel version 2. Version-Release number of selected component (if applicable): libibverbs-1.0.3-1.fc6
Fixed via a rebuild -- libibverbs can use either libsysfs 1 or 2, but of course the binaries depend on what it was built against.