/usr/lib/x86_64-linux-gnu/glibmm-2.4/proc/m4/initialize_glibmm.m4 is in libglibmm-2.4-dev 2.39.93-0ubuntu1.
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 | dnl $Id$
include(initialize_base.m4)
include(initialize_glib.m4)
include(initialize_gio.m4)
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