CMake Warning \(author\) at imported-target\.cmake:[0-9]+ \(add_library\):
  The 'IMPORTED' target 'NS::lib2' uses the generator-expression
  '\$<LINK_GROUP>' with the feature 'feat', which is undefined or unsupported\.

  Did you miss to define it by setting variables
  "CMAKE_C_LINK_GROUP_USING_feat" and
  "CMAKE_C_LINK_GROUP_USING_feat_SUPPORTED"\?
Call Stack \(most recent call first\):
  CMakeLists\.txt:[0-9]+ \(include\)
This warning is for project developers\.  Use -Wno-author to suppress it\.

CMake Error at imported-target\.cmake:[0-9]+ \(add_library\):
  Feature 'feat', specified through generator-expression '\$<LINK_GROUP>' to
  link target 'lib', is not supported for the 'C' link language\.
Call Stack \(most recent call first\):
  CMakeLists\.txt:[0-9]+ \(include\)
