/usr/lib/x86_64-linux-gnu/glibmm-2.4/proc/m4/initialize_glib.m4 is in libglibmm-2.4-dev 2.39.93-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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dnl Initialization rules for glibmm C++ types from Glib C types.
dnl
dnl Basic Types
_INITIALIZATION(`bool&',`gboolean',`$3 = static_cast<bool>($4)')
dnl VariantBase
_INITIALIZATION(`Glib::VariantBase&',`GVariant*',`$3 = Glib::wrap($4)')
dnl VariantType
_INITIALIZATION(`Glib::VariantType&',`const GVariantType*',`$3 = Glib::wrap(const_cast<GVariantType*>($4))')
dnl ustring
_INITIALIZATION(`Glib::ustring&',`gchar*',`$3 = Glib::convert_return_gchar_ptr_to_ustring($4)')
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