I build samba on FreeBSD 6.2-STABLE, and building process
end successfully, as I see.
But libiconv is not used and no conversion happens.
I investigated the configure output, and found that
iconv library is not properly decided.
This is caused by wrong directives in aclocal.m4 file,
concerning iconv.
I installed both libiconv and libbiconv, and SVN comment
shows that biconv should be used if iconv cannot be used.
But using current aclocal.m4 file always used biconv
due to wrong branching condition.

Here is a patch:
--- aclocal.m4.orig     Thu Mar  1 13:55:17 2007
+++ aclocal.m4  Sun Jul 29 08:17:18 2007
@@ -334,7 +334,7 @@
            jm_cv_func_iconv=yes
            jm_cv_lib_iconv="")

-          if test "$jm_cv_lib_iconv" != yes; then
+          if test "$jm_cv_func_iconv" != yes; then
             jm_save_LIBS="$LIBS"
             LIBS="$LIBS -lgiconv"
             AC_TRY_LINK([#include <stdlib.h>
@@ -363,7 +363,7 @@
             jm_cv_lib_iconv="iconv")
           LIBS="$jm_save_LIBS"

-          if test "$jm_cv_lib_iconv" != yes; then
+          if test "$jm_cv_func_iconv" != yes; then
             jm_save_LIBS="$LIBS"
             LIBS="$LIBS -lbiconv"
             AC_TRY_LINK([#include <stdlib.h>