./install.sh
Failed loading /usr/local/lib/ioncube/ioncube_loader_lin_5.0.so:  /usr/local/lib/ioncube/ioncube_loader_lin_5.0.so: undefined symbol: empty_string
Failed loading /usr/local/lib/Zend/ZendOptimizer.so:  /usr/local/lib/Zend/ZendOptimizer.so: undefined symbol: empty_string
Failed loading /usr/local/lib/ioncube/ioncube_loader_lin_5.0.so:  /usr/local/lib/ioncube/ioncube_loader_lin_5.0.so: undefined symbol: empty_string
Failed loading /usr/local/lib/Zend/ZendOptimizer.so:  /usr/local/lib/Zend/ZendOptimizer.so: undefined symbol: empty_string
Your PHP CLI binary does not appear to be working correctly.  Please
correct this problem and then restart this installation script.

 ./install.sh
Failed loading /usr/local/ioncube/ioncube_loader_lin_5.1.so:  /usr/local/ioncube/ioncube_loader_lin_5.1.so: cannot restore segment prot after reloc: Permission denied
Failed loading /usr/local/ioncube/ioncube_loader_lin_5.1.so:  /usr/local/ioncube/ioncube_loader_lin_5.1.so: cannot restore segment prot after reloc: Permission denied
Your PHP CLI binary does not appear to be working correctly.  Please
correct this problem and then restart this installation script.

Looks like a selinux problem.