^CMake Error in CMakeLists\.txt:
  The custom command generating

    [^
]*/Tests/RunCMake/XcodeProject/XcodeDuplicateCustomCommand-build/out\.txt

  is attached to multiple targets:

    drive[0-9]
    drive[0-9]

  but none of these is a common dependency of the other\(s\)\.  This is not
  allowed by the Xcode "new build system"\.