gimp-app build fails: Could not find service "com.apple.CoreSimulator.CoreSimulatorService"

[markb@…]

Building gimp-app on Mac OS X 10.11.2 fails with the following diagnostics:

:notice:build --->  Building gimp-app
:debug:build Executing proc-pre-org.macports.build-build-0
:info:build Could not find service
"com.apple.CoreSimulator.CoreSimulatorService" in domain for uid: 502
:info:build 2015-12-14 06:53:55.738 xcodebuild[64494:2953989] launchctl print returned an error code: 28928
:info:build 2015-12-14 06:53:55.738 xcodebuild[64494:2953989] Failed to locate a valid instance of CoreSimulatorService in the bootstrap.  Adding it now.
:info:build Could not find service "com.apple.CoreSimulator.CoreSimulatorService" in domain for uid: 502
:info:build 2015-12-14 06:53:56.640 xcodebuild[64494:2953989] launchctl print returned an error code: 28928
:info:build 2015-12-14 06:53:56.640 xcodebuild[64494:2953989] *** Assertion failure in -[SimServiceContext reloadServiceIfMovedOrAbortIfWeAreInvalid], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreSimulator/CoreSimulator-201.3/CoreSimulator/SimServiceContext.m:451
:info:build ** INTERNAL ERROR: Uncaught exception **
:info:build Exception: Unable to lookup com.apple.CoreSimulator.CoreSimulatorService in the bootstrap.  This can happen if running with a sandbox profile.  When running with a sandbox profile, make sure that com.apple.CoreSimulator.CoreSimulatorService.xpc is owned by root, not group writable, and not world writable.  See <rdar://problem/22142915>.

[markb@…]

Build log file

[dbevans (David B. Evans)]

Please use Wikiformatting for better readability when quoting terminal or log file contents. The Port: field should also be filled in with the name of the port exhibiting the reported issue. Thanks.