[MacPorts] #30403: openvpn2 @2.2.0 Lion build failure

[MacPorts]

#30403: openvpn2 @2.2.0 Lion build failure
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 Reporter:  nullptr@…          |       Owner:  macports-tickets@…                   
     Type:  defect             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  2.0.0                                
 Keywords:  lion               |        Port:  openvpn2                             
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 Lion no longer defines SOL_IP for {get,set}sockopt(), which breaks the
 build. The attached patch defines SOL_IP to be IPPROTO_IP if SOL_IP is not
 already defined, which seems to work correctly on my machine.

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Ticket URL: <https://trac.macports.org/ticket/30403>
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