Building on FreeBSD: AC_PROG_LIBTOOL: command not found

[Michael B Allen <miallen@ioplex.com>]

Hello,

I'm trying to build 0.7.2 on FreeBSD but autoconf can't find libtool for
some reason:

checking for gawk... (cached) nawk
checking for ln -s or something else... ln -s
checking for __attribute__... yes
./configure: line 4194: AC_PROG_LIBTOOL: command not found
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
checking for openldap... no
checking for krb4... no
checking for crypto library... included libdes
checking if compiling threadsafe libraries... no
checking for egrep... grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... ^C-bash-2.05b$ env | grep PATH
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/local/sbin:/usr/local/bin:/usr/X11R6/bin:/net/ioplex/bin:/net/ioplex/bin:/ioplex/bin:/usr/local/gnu-autotools/bin

$ ls -l /usr/local/bin/libtool             
-r-xr-xr-x  1 root  wheel  225631 Jul 17 14:35 /usr/local/bin/libtool
$ ls -l /usr/local/share/aclocal/libtool.m4
-r--r--r--  1 root  wheel  230594 Jul 17 14:35 /usr/local/share/aclocal/libtool.m4