[MacPorts] #35111: mesa build failure due to using /usr/X11

[MacPorts]

#35111: mesa build failure due to using /usr/X11
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  Reporter:  dougmencken@…          |       Owner:  jeremyhu@…           
      Type:  defect                 |      Status:  reopened             
  Priority:  Normal                 |   Milestone:                       
 Component:  ports                  |     Version:  2.1.1                
Resolution:                         |    Keywords:                       
      Port:  mesa                   |  
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Comment(by dougmencken@…):

 > They don't ship anything that's GPLv3.

 Weird... But anyway, how does GNU make version violate smth?
 Why are other packages perfect: I just installed Subversion with all deps.

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Ticket URL: <https://trac.macports.org/ticket/35111#comment:12>
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