/usr/lib/x86_64-linux-gnu/perl5/5.24/Gtk2/Install/gtk2perl-versions.h is in libgtk2-perl 2:1.2499-1.
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 | #define ATK_MAJOR_VERSION (2)
#define ATK_MINOR_VERSION (22)
#define ATK_MICRO_VERSION (0)
#define ATK_CHECK_VERSION(major,minor,micro) \
(ATK_MAJOR_VERSION > (major) || \
(ATK_MAJOR_VERSION == (major) && ATK_MINOR_VERSION > (minor)) || \
(ATK_MAJOR_VERSION == (major) && ATK_MINOR_VERSION == (minor) && ATK_MICRO_VERSION >= (micro)))
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