head fails to compile with WITHOUT_KERBEROS= in src.conf

Greetings all.

My weekly update to the lastest freebsd-head failed to compile
this morning.  My src.conf has, among other things:

WITHOUT_HESIOD=
WITHOUT_KERBEROS=

# turn off stripping and enable dtrace
STRIP=
CFLAGS+=-fno-omit-frame-pointer

CC=clang
CXX=clang++
CPP=clang-cpp

My compile failed with:

--- secure/lib/libssh__L ---
In file included from /usr/src/secure/lib/libssh/../../../crypto/openssh/jpake.c:43:
/usr/src/secure/lib/libssh/../../../crypto/openssh/auth.h:42:10: fatal error: 'krb5.h' file not found
#include <krb5.h>
         ^
1 error generated.
mkdep: compile failed
*** [.depend] Error code 1

make[4]: stopped in /usr/src/secure/lib/libssh
1 error

-Kurt