I found the following issue.

wrepld cannot be made up.

$ make proto_exists; make bin/wrepld
Generating smbd/build_options.c
Building include/proto.h
creating /home/moriyama/src/samba-3.0.0/source/include/proto.h
Building include/wrepld_proto.h
creating /home/moriyama/src/samba-3.0.0/source/include/wrepld_proto.h
Building include/build_env.h
creating /home/moriyama/src/samba-3.0.0/source/nsswitch/winbindd_proto.h
creating /home/moriyama/src/samba-3.0.0/source/web/swat_proto.h
creating /home/moriyama/src/samba-3.0.0/source/client/client_proto.h
creating /home/moriyama/src/samba-3.0.0/source/utils/net_proto.h
Compiling wrepld/server.c
Compiling wrepld/process.c
Compiling wrepld/parser.c
Compiling wrepld/socket.c
Compiling wrepld/partners.c
Compiling dynconfig.c
Compiling param/loadparm.c
Compiling param/params.c
Compiling ubiqx/ubi_BinTree.c
<snip>
Compiling tdb/tdbback.c
Compiling lib/module.c
Compiling lib/ldap_escape.c
Compiling lib/popt_common.c
Linking bin/wrepld
lib/popt_common.o: In function `popt_common_credentials_callback':
/home/moriyama/src/samba-3.0.0/source/lib/popt_common.c:357: undefined 
reference to `secrets_init'
/home/moriyama/src/samba-3.0.0/source/lib/popt_common.c:362: undefined 
reference to `secrets_fetch_machine_password'
collect2: ld returned 1 exit status
make: *** [bin/wrepld] Error 1