/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.
1 2 3 4 5 6 | 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)
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