[MacPorts] #53866: xorg-libX11 fails on 10.8 with libc++

[MacPorts]

#53866: xorg-libX11 fails on 10.8 with libc++
---------------------+-------------------------
 Reporter:  1-61803  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  xorg-libX11
---------------------+-------------------------
 xorg-libX11 fails to configure on 10.8, when set to build from source with
 `libc++`.

 {{{
 :info:configure checking for cpp... /usr/bin/cpp
 :info:configure checking if /usr/bin/cpp requires -undef... xcrun: Error:
 could not stat active
 Xcode path '/Users/test/Desktop/Xcode.app/Contents/Developer'. (Permission
 denied)
 :info:configure xcrun: Error: could not stat active Xcode path
 '/Users/test/Desktop/Xcode.
 app/Contents/Developer'. (Permission denied)
 :info:configure xcrun: Error: could not stat active Xcode path
 '/Users/test/Desktop/Xcode.
 app/Contents/Developer'. (Permission denied)
 :info:configure configure: error: /usr/bin/cpp defines unix with or
 without -undef.  I don't know
 what to do.
 }}}

 It does build on the same system though, a 10.8 vanilla vm, when set to
 build from source with `libstdc++`, only adjustment being changing the
 path with `xcode-select`.

 There's a similar ticket under 10.12, closed as worksforme #52335. I
 attached the logs.

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Ticket URL: <https://trac.macports.org/ticket/53866>
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