/usr/share/lintian/overrides/libgtkglextmm-x11-1.2-0v5 is in libgtkglextmm-x11-1.2-0v5 1.2.0-8.
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 | #
# With C++ maintaining symbols control files is a mess
# leaving it out for now
#
libgtkglextmm-x11-1.2-0v5: no-symbols-control-file
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