[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:  closed               
  Priority:  Normal                 |   Milestone:                       
 Component:  ports                  |     Version:  2.1.1                
Resolution:  worksforme             |    Keywords:                       
      Port:  mesa                   |  
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Comment(by jeremyhu@…):

 There's nothing that MacPorts can do to fix this issue.  The error is on
 your end with bugs in software that you have installed.  We can't protect
 you from yourself.

 If you start replacing your development tools with ones you've built
 yourself, then you need to expect that such a configuration won't be
 supported by anybody (MacPorts, fink, Homebrew, ...) and you need to have
 the experience and knowledge to fix fallout yourself.  If you don't have
 that experience and knowledge, then just do the fix that I gave you, and
 hopefully things will "just work" for you...

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Ticket URL: <https://trac.macports.org/ticket/35111#comment:17>
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