I have been unable to get configure to find the correct kerberos files if the
SUN packages are installed. I specified the kerberos file locations in the
arguments to configure. My configure line is

CC='cc' CXX=CC \
CPPFLAGS='-I/usr/local/include -I/usr/local/openldap/include
-I/usr/local/sasl/include -I/usr/local/kerberos/include
-I/usr/local/BerkeleyDB.4.1/include -I/usr/local/openssl/include' \
CFLAGS='-xarch=v9a' \
LDFLAGS='-L/usr/local/lib/sparcv9 -L/usr/local/openldap/lib
-L/usr/local/sasl/lib -L/usr/local/kerberos/lib -L/usr/local/BerkeleyDB.4.1/lib
-L/usr/local/openssl/lib -R\\$$ORIGIN -R/usr/local/lib/sparcv9
-R/usr/local/openldap/lib -R/usr/local/sasl/lib -R/usr/local/kerberos/lib
-R/usr/local/BerkeleyDB.4.1/lib -R/usr/local/openssl/lib' \
./configure \
--with-readline \
--with-libiconv=/usr/local \
--with-ldap \
--with-krb5=/usr/local/kerberos \
--with-ldapsam \
--with-automount \
--with-libsmbclient \
--with-acl-support \
--with-winbind \
--prefix=/usr/local

The workaround has been to temporarily move the SUN package files out of the way
while building Samba.