How to depend on a variant (or do I want subports)?

[Gregor Jasny]

Hello,

recently I forked Xsnmp because the author completely stepped back from
maintaining it. It can be found here: https://github.com/gjasny/Xsnmp

There is an Xcode project to build a complete installer including a
(IMHO) limited preferences pane to enable the SNMP deamon and the Xsnmp
agent.

For my own servers I'd prefer having Xsnmp in MacPorts. This would ease
starting and upgrading.

Now to my question: xsnmp depends on the libnetsnmp and libnetsnmpagent
libraries and headers. They are provided by MacOS itself. But as an
alternative port I'd have to specify net-snmp. Unfortunately these libs
are only provided in the +server variant.

So how do I achieve the necessary dependency? I read some vague things
about subports but did not find any concrete documentation.

For reference I attached the preliminary Xsnmp Portfile. Once I make a
real 1.2.0 release I'll convert it to using tarballs.

Thanks,
Gregor

PS: How to specify beta version numbers? I assume 1.2.0-beta1 is newer
that 1.2.0. In Debian I'd use 1.2.0~beta1.
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# -*- coding: utf-8; mode: tcl; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- vim:fenc=utf-8:ft=tcl:et:sw=4:ts=4:sts=4
# $Id$

PortSystem          1.0

name                xsnmp
version             1.2.0
revision            1
categories          net
license             Apache-2
platforms           darwin
maintainers         googlemail.com:gjasny openmaintainer
description         SNMP agent extension to query Mac OS and Apple values

fetch.type          git
git.url             git://github.com/gjasny/Xsnmp.git

depends_lib         port:pcre
depends_lib         lib:libnetsnmp:net-snmp
depends_lib         lib:libnetsnmpagent:net-snmp

use_autoreconf  yes
autoreconf.args -fvi

startupitem.create  yes
startupitem.executable  ${prefix}/sbin/xsnmp -f

post-destroot {
    xinstall -d -m 755 ${destroot}${prefix}/share/snmp/mibs
    xinstall -W ${worksrcpath} -m 644 mib/XSNMP-MIB.txt ${destroot}${prefix}/share/snmp/mibs/
}