Updated Qt binaries are now up.
[rahlquist@corgi 64]$ ./primecoin-qt
./primecoin-qt: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by ./primecoin-qt)
./primecoin-qt: /lib64/libc.so.6: version `GLIBC_2.15' not found (required by ./primecoin-qt)
./primecoin-qt: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by ./primecoin-qt)
Highest version of Glibc avail in stable for Cent/Rhel etc is 2.12