slippy$ make -DKQDTRACE buildkernel
make[1]: "/export/home/cy/freebsd/svn2/current/Makefile.inc1" line 1144: Missing KERNCONF /export/home/cy/freebsd/svn2/current/sys/amd64/conf/PROD
*** Error code 1
Stop.
make: stopped in /export/home/cy/freebsd/svn2/current
slippy$
make.conf contains the following,
.ifdef KQDTRACE
KERNCONF?= BREAK PROD
INSTALLKERNEL?= BREAK
ALL_MODLES= yes
.endif