CONFIG_ALPHA_EV5 is not available for thedefaultarchitecture x86.
Result is shown for architecture alpha

EV5 CPU(s) (model 5/xxx)?

configname: CONFIG_ALPHA_EV5

Linux Kernel Configuration
└─>System setup
└─>EV5 CPU(s) (model 5/xxx)?
In linux kernel since version 2.6.12