IMPORTED

Read-only indication of whether a target is IMPORTED.

The boolean value of this property is True for targets created with the IMPORTED option to add_executable() or add_library(). It is False for targets built within the project.

© 2000–2016 Kitware, Inc.
© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.6/prop_tgt/IMPORTED.html