CONFIG_NFCON is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

NatFeat console driver

modulename: nfcon.ko

configname: CONFIG_NFCON

Linux Kernel Configuration
└─>Platform devices
└─>NatFeat console driver
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
Say Y to include support for the ARAnyM NatFeat console driver
which allows the console output to be redirected to the stderr
output of ARAnyM.

source code: