Gentoo's Bugzilla –
Attachment 585764 Details for
Bug 691492sci-libs/tensorflow-1.13.1 - In file included from tensorflow/core/platform/cloud/gcs_file_system.cc:29: bazel-out/k8-opt/genfiles/external/jsoncpp_git/include/json/config.h:132:10: fatal error: allocator.h: No such file or directory