CMP0021-------Fatal error on relative paths in INCLUDE_DIRECTORIES target property.CMake 22.214.171.124 and lower allowed the INCLUDE_DIRECTORIES targetproperty to contain relative paths. The base path for such relativeentries is not well defined. CMake 2.8.12 issues a FATAL_ERROR if theINCLUDE_DIRECTORIES property contains a relative path.The OLD behavior for this policy is not to warn about relative pathsin the INCLUDE_DIRECTORIES target property. The NEW behavior for thispolicy is to issue a FATAL_ERROR if INCLUDE_DIRECTORIES contains arelative path.This policy was introduced in CMake version 2.8.12. CMake version|release| warns when the policy is not set and uses OLD behavior. Usethe cmake_policy command to set it to OLD or NEW explicitly.