[MacPorts] #58585: mkconsole failing to build due to new build system in Xcode 10

[MacPorts]

#58585: mkconsole failing to build due to new build system in Xcode 10
------------------------+--------------------
  Reporter:  d0wntime   |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.4
Resolution:             |   Keywords:
      Port:  mkconsole  |
------------------------+--------------------

Comment (by mf2k):

 Error appears to be:
 {{{
 :info:build Details:  Failed to create workspace arena at
 <DVTFilePath:0x7fe91d0f43b0:'/opt/local/var/macports/home/Library/Developer/Xcode/DerivedData
 /MkConsole-bnyoygzoiqxsexettijldqeehkuk'>: Error Domain=NSCocoaErrorDomain
 Code=513 "You don’t have permission to save the file “MkConsole-
 bnyoygzoiqxsexettijldqeehkuk” in the folder “DerivedData”."
 UserInfo={NSFilePath=/opt/local/var/macports/home/Library/Developer/Xcode/DerivedData
 /MkConsole-bnyoygzoiqxsexettijldqeehkuk, NSUnderlyingError=0x7fe91d32d1c0
 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58585#comment:2>
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