[MacPorts] #26723: MacVim @7.3.snapshot54 build fails

[MacPorts]

#26723: MacVim @7.3.snapshot54 build fails
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 Reporter:  larry.velazquez@…          |       Owner:  raimue@…           
     Type:  defect                     |      Status:  assigned           
 Priority:  Normal                     |   Milestone:                     
Component:  ports                      |     Version:  1.9.1              
 Keywords:                             |        Port:  MacVim             
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Comment(by volker.menrad@…):

 Got the same error as larry (with the default variant). In particular
 {{{
 error: one or more PCH files were found, but they were invalid
 error: use -Winvalid-pch for more information
 }}}

 It seems that the PCH file was left by some older compilation in the
 global cache directory. So I changed the location of the precompiled
 headers using the above patch and it now compiles and runs for me.

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Ticket URL: <https://trac.macports.org/ticket/26723#comment:6>
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