[MacPorts] #31712: Invalid cairo build on Lion for previous SDKs

[MacPorts]

#31712: Invalid cairo build on Lion for previous SDKs
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 Reporter:  spolitov@…          |       Owner:  macports-tickets@…                   
     Type:  defect              |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  2.0.3                                
 Keywords:                      |        Port:  cairo                                
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 Cairo port introduces patch when building on Mac OS X Lion.
 The patch named lion_fonts.diff.
 The problem appears when cairo is build on Lion but for previous version
 of SDK (for instance Snow Leopard).
 This diff introduces the check:
 MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
 But MAC_OS_X_VERSION_10_7 is undefined for these SDKs.

 I've attached suggested fix for this issue.

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Ticket URL: <https://trac.macports.org/ticket/31712>
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