Cloning into 'libproperties'...
libproperties/1.1.2: WARN: Build folder is dirty, removing it: /Users/jenkins/w/cci_PR-3877@2/.conan/data/libproperties/1.1.2/_/_/build/b08b9c5744b12aea1e424a3c0d22fe80bd9b3cc3
[HOOK - conan-center.py] post_source(): ERROR: [LIBCXX MANAGEMENT (KB-H011)] Can't detect C++ source files but recipe does not remove 'self.settings.compiler.libcxx' (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H011) 
[HOOK - conan-center.py] post_source(): ERROR: [CPPSTD MANAGEMENT (KB-H022)] Can't detect C++ source files but recipe does not remove 'self.settings.compiler.cppstd' (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H022) 
ERROR: [HOOK - conan-center.py] post_source(): Some checks failed running the hook, check the output