/usr/include/ is in libgearman-dev 1.0.6-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libgearman-1.0/
/usr/include/libgearman-1.0/task.h
/usr/include/libgearman-1.0/job.h
/usr/include/libgearman-1.0/core.h
/usr/include/libgearman-1.0/aggregator.h
/usr/include/libgearman-1.0/string.h
/usr/include/libgearman-1.0/version.h
/usr/include/libgearman-1.0/client_callbacks.h
/usr/include/libgearman-1.0/util.h
/usr/include/libgearman-1.0/constants.h
/usr/include/libgearman-1.0/limits.h
/usr/include/libgearman-1.0/execute.h
/usr/include/libgearman-1.0/job_handle.h
/usr/include/libgearman-1.0/configure.h
/usr/include/libgearman-1.0/ostream.hpp
/usr/include/libgearman-1.0/interface/
/usr/include/libgearman-1.0/interface/task.h
/usr/include/libgearman-1.0/interface/status.h
/usr/include/libgearman-1.0/return.h
/usr/include/libgearman-1.0/gearman.h
/usr/include/libgearman-1.0/result.h
/usr/include/libgearman-1.0/task_attr.h
/usr/include/libgearman-1.0/client.h
/usr/include/libgearman-1.0/priority.h
/usr/include/libgearman-1.0/signal.h
/usr/include/libgearman-1.0/kill.h
/usr/include/libgearman-1.0/allocator.h
/usr/include/libgearman-1.0/worker.h
/usr/include/libgearman-1.0/parse.h
/usr/include/libgearman-1.0/packet.h
/usr/include/libgearman-1.0/actions.h
/usr/include/libgearman-1.0/argument.h
/usr/include/libgearman-1.0/strerror.h
/usr/include/libgearman-1.0/status.h
/usr/include/libgearman-1.0/connection.h
/usr/include/libgearman-1.0/visibility.h
/usr/include/libgearman-1.0/function.h
/usr/include/libgearman-1.0/universal.h
/usr/include/libgearman-1.0/protocol.h
/usr/include/libgearman/
/usr/include/libgearman/gearman.h