[MacPorts] #61852: json-glib @1.2.8 build fails with commandline tools for XCode 12.3

[MacPorts]

#61852: json-glib @1.2.8 build fails with commandline tools for XCode 12.3
-----------------------+-----------------------
 Reporter:  MStraeten  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.4
 Keywords:             |       Port:  json-glib
-----------------------+-----------------------
 --->  Building json-glib
 Error: Failed to build json-glib: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_devel_json-glib/json-glib/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 Error: Processing of port json-glib failed

 failed while rebuilding after purging my old macports installation, my
 build from 15.11.2020 was successful (big sur, sdk 11.1 + Xcode 12.??)

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Ticket URL: <https://trac.macports.org/ticket/61852>
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