CMake Error in CMakeLists\.txt:
  export called with target "exported" which requires target "doubleexported"
  that is not in this export set, but in another export set which is exported
  multiple times with different namespaces:.*
  .*/Tests/RunCMake/export/DependOnDifferentNamespaceExport-build/export1\.cmake,.*
  .*/Tests/RunCMake/export/DependOnDifferentNamespaceExport-build/export2\.cmake\.
+
  An exported target cannot depend upon another target which is exported in
  more than one export set or with more than one namespace\.  Consider
  consolidating the exports of the "doubleexported" target to a single
  export\.
+
CMake Generate step failed\.  Build files cannot be regenerated correctly\.
