[MacPorts] #31385: sane-backends uses net-snmp without declaring dependency

[MacPorts]

#31385: sane-backends uses net-snmp without declaring dependency
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 Reporter:  ryandesign@…             |       Owner:  aguynamedryan+sane@…        
     Type:  defect                   |      Status:  new                         
 Priority:  Normal                   |   Milestone:                              
Component:  ports                    |     Version:  2.0.3                       
 Keywords:                           |        Port:  net-snmp                    
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 I discovered that the sane-backends libraries are linked with
 /opt/local/lib/libnetsnmp.25.dylib on my system. This causes attempts to
 use sane-backends to fail, since /opt/local/lib/libnetsnmp.25.dylib does
 not exist anymore, ever since net-snmp was updated to library version 30
 in r80042. I had also increased the revision of all other known ports
 using net-snmp, to force a rebuild against the new library version, but
 because sane-backends doesn't declare this dependency I didn't know to
 increase its revision.

 sane-backends should probably increase its revision to force a rebuild
 against the current version of net-snmp, and declare a dependency on net-
 snmp. I'm attaching a patch to do this, which I'd be happy to commit if
 you agree. Alternately, the port could be modified to not use net-snmp,
 even if it is already installed.

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Ticket URL: <https://trac.macports.org/ticket/31385>
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