--- linux-2.6.15/drivers/char/Kconfig.orig	2006-02-01 12:51:53.000000000 -0600
+++ linux-2.6.15/drivers/char/Kconfig	2006-02-01 12:52:12.000000000 -0600
@@ -712,7 +712,7 @@
 	  module will be called rtc.
 
 config RTC_HISTOGRAM
-	tristate "Real Time Clock Histogram Support"
+	bool "Real Time Clock Histogram Support"
 	default n
 	depends on RTC
 	---help---