WARNING: could not find /usr/src/modules/fglrx/.libfglrx_ip.a.GCC4.cmd     ▒ 
 │ for /usr/src/modules/fglrx/libfglrx_ip.a.GCC4                              ▒ 
 │ FATAL: modpost: GPL-incompatible module fglrx.ko uses GPL-only symbol      ▒ 
 │ '__rcu_read_lock'                                                          ▒ 
 │ make[2]: *** [__modpost] Error 1                                           ▒ 
 │ make[1]: *** [modules] Error 2                                             ▒ 
 │ make[1]: Leaving directory `/usr/src/linux-headers-2.6.22-14-rt'           ▒ 
 │ make: *** [build] Error 2                                                    
 │ ^Y