[HOOK - conan-center.py] pre_export(): ERROR: [RECIPE METADATA (KB-H003)] Conanfile doesn't have 'homepage' attribute.  (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H003) 
[HOOK - conan-center.py] pre_export(): WARN: [FPIC OPTION (KB-H006)] This recipe does not include an 'fPIC' option. Make sure you are using the right casing
[HOOK - conan-center.py] pre_export(): ERROR: [CONAN CENTER INDEX URL (KB-H027)] The attribute 'url' should point to: https://github.com/conan-io/conan-center-index (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H027) 
[HOOK - conan-center.py] pre_export(): ERROR: [TEST PACKAGE - NO IMPORTS() (KB-H034)] The method `imports` is not allowed in test_package/conanfile.py (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H034) 
[HOOK - conan-center.py] pre_export(): ERROR: [NO AUTHOR (KB-H037)] Conanfile should not contain author. Remove 'author = "Aleksey Vaneev"' (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H037) 
[HOOK - conan-center.py] pre_export(): ERROR: [NO FINAL ENDLINE (KB-H041)] File '/home/conan/workspace/cci_PR-2536/1/co_0_0/recipes/r8brain-free-src/all/CMakeLists.txt' does not end with an endline (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H041) 
[HOOK - conan-center.py] pre_export(): ERROR: [CMAKE VERSION REQUIRED (KB-H048)] The test_packages/CMakeLists.txt requires CMake 3.1 at least. Update to 'cmake_minimum_required(VERSION 3.1)'. (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H048) 
ERROR: [HOOK - conan-center.py] pre_export(): Some checks failed running the hook, check the output