CMake Warning \(dev\) in CMakeLists.txt:
  Policy CMP0111 is not set: An imported target missing its location property
  fails during generation.  Run "cmake --help-policy CMP0111" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.

  IMPORTED_LOCATION not set for imported target "unknown_lib"( configuration
  ".+")?.
This warning is for project developers.  Use -Wno-dev to suppress it.
+
CMake Warning \(dev\) in CMakeLists.txt:
  Policy CMP0111 is not set: An imported target missing its location property
  fails during generation.  Run "cmake --help-policy CMP0111" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.

  IMPORTED_LOCATION not set for imported target "static_lib"( configuration
  ".+")?.
This warning is for project developers.  Use -Wno-dev to suppress it.
+
CMake Warning \(dev\) in CMakeLists.txt:
  Policy CMP0111 is not set: An imported target missing its location property
  fails during generation.  Run "cmake --help-policy CMP0111" for policy
  details.  Use the cmake_policy command to set the policy and suppress this
  warning.

  IMPORTED_IMPLIB not set for imported target "shared_lib"( configuration
  ".+")?.
This warning is for project developers.  Use -Wno-dev to suppress it.