CONFIG_SENSORS_ULTRA45 is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

Sun Ultra45 PIC16F747

modulename: ultra45_env.ko

configname: CONFIG_SENSORS_ULTRA45

Linux Kernel Configuration
└─>Device Drivers
└─>Hardware Monitoring support
└─>Sun Ultra45 PIC16F747
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
This driver provides support for the Ultra45 workstation environmental
sensors.

source code:
drivers/hwmon/ultra45_env.c