[MacPorts] #63720: MacPorts fails to realize macOS 12 SDK is already installed

[MacPorts]

#63720: MacPorts fails to realize macOS 12 SDK is already installed
----------------------------+--------------------
 Reporter:  petertorelli    |      Owner:  (none)
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.7.1
 Keywords:  sdk12 monterey  |       Port:
----------------------------+--------------------
 I updated my OS to Monterey, Xcode to 13.1 and downloaded the latest
 MacPorts (2.7.1) from the link on this site.

 Following the migration steps on this site I encouter the following error
 (I replaced the batch re-install command with just a single request to
 install autoconf).

 {{{
 % sudo port install autoconf
 Warning: The macOS 12 SDK does not appear to be installed. Ports may not
 build correctly.
 Warning: You can install it as part of the Xcode Command Line Tools
 package by running `xcode-select --install'.
 % xcode-select --install
 xcode-select: error: command line tools are already installed, use
 "Software Update" to install updates
 % xcodebuild -showsdks
 DriverKit SDKs:
         DriverKit 21.0.1                -sdk driverkit21.0.1

 iOS SDKs:
         iOS 15.0                        -sdk iphoneos15.0

 iOS Simulator SDKs:
         Simulator - iOS 15.0            -sdk iphonesimulator15.0

 macOS SDKs:
         macOS 12.0                      -sdk macosx12.0

 tvOS SDKs:
         tvOS 15.0                       -sdk appletvos15.0

 tvOS Simulator SDKs:
         Simulator - tvOS 15.0           -sdk appletvsimulator15.0

 watchOS SDKs:
         watchOS 8.0                     -sdk watchos8.0

 watchOS Simulator SDKs:
         Simulator - watchOS 8.0         -sdk watchsimulator8.0
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/63720>
MacPorts <https://www.macports.org/>
Ports system for macOS