Rather than an option, automatically detect if the target system

has an amd rc script. Eventually when amd is removed from base
packages will automatically include the rc script.

Adjust the location of the amd binary in the supplied rc script.

MFH:		2019Q4

sysutils/am-utils/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	am-utils
 PORTVERSION=	6.2
-PORTREVISION=	7
+PORTREVISION=	8
 PORTEPOCH=	1
 CATEGORIES=	sysutils net
 MASTER_SITES=	ftp://ftp.am-utils.org/pub/am-utils/ \
@@ -16,10 +16,9 @@ COMMENT=	Berkeley Automounter Suite of Utilities
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-OPTIONS_DEFINE=	OPENLDAP DOCS RC
+OPTIONS_DEFINE=	OPENLDAP DOCS
 OPTIONS_DEFAULT=OPENLDAP
 OPENLDAP_DESC=	OpenLDAP support
-RC_DESC=	Use the rc script in this port
 
 USES=		autoreconf:build bison libtool makeinfo perl5
 USE_LDCONFIG=	yes
@@ -44,7 +43,9 @@ OPENLDAP_PORTDOCS=		README.ldap ldap-id.txt ldap.schema
 
 OPTIONS_SUB=	yes
 
-RC_USE_RC_SUBR=	amd
+.if !exists(/etc/rc.d/amd)
+USE_RC_SUBR=	amd
+.endif
 
 post-patch:
 	@${RM} ${WRKSRC}/doc/am-utils.info*

sysutils/am-utils/files/amd.in

@@ -14,7 +14,7 @@
 name="amd"
 desc="Automatically mount filesystems"
 rcvar="amd_enable"
-command="/usr/sbin/${name}"
+command=%%PREFIX%%/sbin/${name}
 start_precmd="amd_precmd"
 command_args="&"
 extra_commands="reload"