CMake in EPEL6 is age-old. Please update it to the 2.8 series; the rawhide srpm works out-of-the-box. You might consider updating the EPEL5 branch as well; however the rawhide srpm doesn't compile on EL5 due to the ancient version of Qt.
The srpm builds fine on EL5 if the --without gui flag is passed.
cmake is in RHEL6, not EPEL6. *** This bug has been marked as a duplicate of bug 606892 ***