/usr/share/doc/libgtkglextmm-x11-1.2-doc/html/gtkglext_2gtkmm_2gl_2init_8h__dep__incl.map is in libgtkglextmm-x11-1.2-doc 1.2.0-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | base referer
rect $gtkglmm_8h.html 166,8 249,32
|