This file is indexed.

/usr/lib/gstreamermm-0.10/gen/m4/plugingen.m4 is in libgstreamermm-0.10-dev 0.10.11-0ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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dnl Copyright 2008 The gstreamermm Development Team

dnl Other gstreamermm libraries can provide their own plugingen.m4 file for
dnl plug-in generation, maybe also including the same files as this one.

include(plugingen_gstreamermm.m4)