[MacPorts] #35729: Samba3 fails to build in presence of an activated, installed samba4 port

[MacPorts]

#35729: Samba3 fails to build in presence of an activated, installed samba4 port
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 Reporter:  ajdudman@…              |       Owner:  macports-tickets@…                   
     Type:  defect                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  2.1.99                               
 Keywords:  haspatch                |        Port:  samba3                               
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 I find the samba3 port fails to build in the presence of activated,
 installed samba4 port.  My patch to the samba3 Portfile checks for this
 and produces a pre-build message and error.

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Ticket URL: <https://trac.macports.org/ticket/35729>
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