6.0-RELEASE sparc64 kernel build error (missing clock_if.h)

[Boris Kochergin]

Hi.

This is my first time posting to a @freebsd.org list, so my apologies in 
advance if this should have gone to the sparc64 list or somewhere else. 
That aside, I've been attempting to build a custom kernel on a Sun Netra 
X1 for it to be a lightweight NAT/VLAN machine using the RELENG_6_0 
sources and have encountered the following problem (I've googled quite a 
bit to find any similar cases, but to no avail).

[snip of "make buildkernel..." output]

make -V CFILES -V SYSTEM_CFILES -V GEN_CFILES |  MKDEP_CPP="cc -E" 
CC="cc" 
xargs                                                                                        

 mkdep -a -f .newdep -O2 -pipe -fno-strict-aliasing  -Wall 
-Wredundant-decls 
-Wn                                                                                        

ested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith 
-Winline                                                                                        

 -Wcast-qual  -fformat-extensions -std=c99  -nostdinc -I-  -I. 
-I/usr/src/sys 
-I                                                                                        

/usr/src/sys/contrib/dev/acpica -I/usr/src/sys/contrib/altq 
-I/usr/src/sys/contr                                                                                        

ib/ipfilter -I/usr/src/sys/contrib/pf -I/usr/src/sys/contrib/dev/ath 
-I/usr/src/                                                                                        

sys/contrib/dev/ath/freebsd -I/usr/src/sys/contrib/ngatm 
-I/usr/src/sys/dev/twa                                                                                         

-D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common 
-finlin                                                                                        

e-limit=15000 --param inline-unit-growth=100 --param 
large-function-growth=1000                                                                                         

 -mcmodel=medlow -msoft-float -ffreestanding
/usr/src/sys/sparc64/sparc64/rtc.c:58:22: clock_if.h: No such file or 
directory
mkdep: compile failed
*** Error code 1

Stop in /usr/obj/usr/src/sys/SUNNY.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.

---

This file is nowhere to be found on the system, only a "clock_if.m", but 
its content isn't what the build process wants. Any ideas? Thanks in 
advance.

-Boris