Can you provide the output for

'/usr/local/phenix-dev-2666/base/bin/python /usr/local/phenix-dev-2666/modules/cctbx_project/libtbx/configure.py --current_working_directory /usr/local/phenix-dev-2666/build --command_version_suffix dev-2666 phenix phaser solve_resolve labelit dials xia2 iota prime'

That is the command that is failing.

Also, which installer are you using? The CentOS 6 installer is generally more compatible with more recent versions.