[MacPorts] #64086: graphviz-gui and graphviz-gui-devel @2.49.3 fail to build on macOS 12.1 beta (21C5039b) with Xcode 13.2 beta (13C5066c)

[MacPorts]

#64086: graphviz-gui and graphviz-gui-devel @2.49.3 fail to build on macOS 12.1
beta (21C5039b) with Xcode 13.2 beta (13C5066c)
---------------------------+--------------------
  Reporter:  thomasleaute  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  graphviz-gui  |
---------------------------+--------------------

Comment (by thomasleaute):

 Here are the contents of main.log as pointed by `port logfile graphviz-
 gui`:

 {{{
 version:1
 :debug:main Starting logging for graphviz-gui @2.49.3_0
 :debug:sysinfo macOS 12.1 (darwin/21.2.0) arch i386
 :debug:sysinfo MacPorts 2.7.1
 :debug:sysinfo Xcode none
 :debug:sysinfo SDK 12
 :debug:sysinfo MACOSX_DEPLOYMENT_TARGET: 12.0
 :error:main Port graphviz-gui requires a full Xcode installation, which
 was not found on your system.
 :error:main You can install Xcode from the Mac App Store or
 https://developer.apple.com/xcode/
 }}}

 I have now upgraded to Xcode 13.2 beta 2 (13C5081f), hoping that it would
 fix the issue, but it didn't.

 `xcode-select --install` reports that the command line tools are already
 installed. However, when I follow
 [https://trac.macports.org/wiki/ProblemHotlist#reinstall-clt these
 instructions], `pkgutil` can't seen to find the CLT receipt. I am hesitant
 to following the instructions to re-install the CLT package, since I am
 using a beta version of Xcode, which I don't expect is necessarily
 available via Software Update (I downloaded this version of Xcode from the
 Apple Developer website).

-- 
Ticket URL: <https://trac.macports.org/ticket/64086#comment:4>
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