Gentoo's Bugzilla –
Attachment 585226 Details for
Bug 689282sci-libs/tensorflow-1.14 with dev-libs/jsoncpp-1.9 - In file included from tensorflow/core/platform/cloud/gcs_file_system.cc:29: bazel-out/host/genfiles/external/jsoncpp_git/include/json/config.h:127:10: fatal error: allocator.h: No such file or directory