/usr/lib/x86_64-linux-gnu/gstreamermm-1.0/gen/m4/shared.m4 is in libgstreamermm-1.0-dev 1.10.0+dfsg-1.
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 7 8 9 | dnl Copyright 2008 The gstreamermm Development Team
dnl _IS_GSTREAMERMM_PLUGIN
dnl
dnl Signals that a generated class is a plug-in. The macro is just processed
dnl to remove it from the generated file. generate_wrap_init.pl will look for
dnl this in the original .hg file.
dnl
define(`_IS_GSTREAMERMM_PLUGIN',`')dnl
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