Ao instalar o samba via ports no FreeBSD com suporte ao AD (Active Directory) da Microsoft, pode acontecer de o samba não compilar e terminar com o seguinte erro

Compiling libsmb/clikrb5.c
libsmb/clikrb5.c: In function `krb5_set_real_time':
libsmb/clikrb5.c:128: error: dereferencing pointer to incomplete type
libsmb/clikrb5.c:129: error: dereferencing pointer to incomplete type
The following command failed:
cc -I. -I/usr/ports/net/samba3/work/samba-3.0.26a/source  -O2 -pipe
-march=prescott -D_SAMBA_BUILD_=3 -I/usr/local/include
-I/usr/ports/net/samba3/work/samba-3.0.26a/source/iniparser/src
-Iinclude -I./include  -I. -I. -I./lib/replace -I./lib/talloc
-I./tdb/include -I./libaddns -I./librpc -DHAVE_CONFIG_H
-I/usr/local/include -DLDAP_DEPRECATED
-I/usr/ports/net/samba3/work/samba-3.0.26a/source/lib -D_SAMBA_BUILD_=3
-fPIC -DPIC -c libsmb/clikrb5.c -o libsmb/clikrb5.o
*** Error code 1

Stop in /usr/ports/net/samba3/work/samba-3.0.26a/source.
*** Error code 1

Stop in /usr/ports/net/samba3.
*** Error code 1

Stop in /usr/ports/net/samba3.

Para resolver isso, instale, pelo ports, o krb5

cd /usr/ports/security/krb5
make install

Em seguida, volte ao port do samba e prossiga com a instalação

cd /usr/ports/net/samba3
make clean
make KRB5_HOME=/usr/local
make install