treating OPTIONS

[SADA Kenji]

Please see the PR 63930
<http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/63930>

it gets portlint fatal error that OPTIONS appears after the line
".include <bsd.port.pre.mk>".
 My plan is pre-defined LOCALBASE, like:

---
PORTNAME=       libhome
PORTVERSION=    0.7.1
PORTREVISION=   1
CATEGORIES=     misc
MASTER_SITES=   ${MASTER_SITE_SOURCEFORGE}
MASTER_SITE_SUBDIR=     pll

MAINTAINER=     kiwi at oav.net
COMMENT=        Library providing a getpwname() emulation

LOCALBASE?=     ${DESTDIR}/usr/local

.if exists(${LOCALBASE}/lib/libldap.so)
WITH_LDAP=      yes
OPTIONS+=       LDAP "Support for LDAP queries" on
.else
OPTIONS+=       LDAP "Support for LDAP queries" off
.endif

<snip>

.include <bsd.port.pre.mk>

<snip>

.include <bsd.port.post.mk>
---

This gets one portlint warning instead of many fatal errors.
Other options?