CMake Warning \(policy\) at CMP0223-if-WARN\.cmake:[0-9]+ \(if\):
  Policy CMP0223 is not set: An empty path is not a prefix of any path\.  Run
  "cmake --help-policy CMP0223" for policy details\.  Use the cmake_policy
  command to set the policy and suppress this warning\.
Call Stack \(most recent call first\):
  CMakeLists\.txt:[0-9]+ \(include\)
This warning is for project developers\.  Use -Wno-author or -Wno-policy to
suppress it\.
