Created attachment 538308 [details, diff] protobuf-3.6.0-system_libraries.patch These are out: dev-libs/protobuf-3.6.0 dev-python/protobuf-python-3.6.0 dev-java/protobuf-java-3.6.0 A simple copy worked for the ebuilds for me. ${PN}-3.5.0-atomic_operations.patch is upstream now. ${PN}-3.6.0-system_libraries.patch needs updating, I'm attaching. All the tests pass on my machine.
These were done in commit c1694bf6284cf83ed6370739989d95bfbeb01db7 dev-python/protobuf-python: Version bump (3.6.0.1). commit ff5c8c0b0c9989e72df95f3bec12bc8083d157b0 dev-java/protobuf-java: Version bump (3.6.0.1). commit 52c7cd4159d9a0b9eda57de784e36c0aafb73fee dev-libs/protobuf: Version bump (3.6.0.1). Thanks