CONFIG_RTC_LIB (not configurable)

modulename: rtc-lib.ko

configname: CONFIG_RTC_LIB

Linux Kernel Configuration
└─>Device Drivers
└─>RTC_LIB
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
drivers/rtc/rtc-lib.c