CONFIG_SLHC (not configurable)

modulename: slhc.ko

configname: CONFIG_SLHC

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>SLHC
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This option enables Van Jacobsen serial line header compression
routines.

source code: