[asterisk-users] Native architecture never available in menuselect

[CDR]

I want to compile Asterisk always for the native architecture of the
machine, and I find that it is never available. It says
Depends on: native_arch(E)
   Can use: N/A
 Conflicts with: N/A
 Support Level: core

This is Fedora 20
gcc (GCC) 4.8.3 20140624 (Red Hat 4.8.3-1)
many thanks
Philip