[MacPorts] #57325: MacVim build fails under Mojave

[MacPorts]

#57325: MacVim build fails under Mojave
-----------------------+--------------------
 Reporter:  inyeollee  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.5.4
 Keywords:  xcode10    |       Port:  MacVim
-----------------------+--------------------
 MacVim build fails under Mojave.

 main.log:
 :info:build Details:  Failed to create workspace arena at
 <DVTFilePath:0x7f9dd8a075e0:'/opt/local/var/macports/home/Library/Developer/Xcode/DerivedData
 /MacVim-esamqxwogjmlbqflr
 ekcgedccbnl'>: Error Domain=NSCocoaErrorDomain Code=513 "You don’t have
 permission to save the file “MacVim-esamqxwogjmlbqflrekcgedccbnl” in the
 folder “DerivedData”." UserInfo
 ={NSFilePath=/opt/local/var/macports/home/Library/Developer/Xcode/DerivedData
 /MacVim-esamqxwogjmlbqflrekcgedccbnl, NSUnderlyingError=0x7f9dd5dc1260
 {Error Domain=NSPOSIXErrorDo
 main Code=1 "Operation not permitted"}}

 It looks like the same issue as #57315, related to Xcode10.

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Ticket URL: <https://trac.macports.org/ticket/57325>
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