/usr/lib/x86_64-linux-gnu/perl5/5.24/Gnome2/Wnck/Install/wnck2perl-version.h is in libgnome2-wnck-perl 0.16-3+b3.
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 WNCK_MAJOR_VERSION (2)
#define WNCK_MINOR_VERSION (30)
#define WNCK_MICRO_VERSION (7)
#define WNCK_CHECK_VERSION(major,minor,micro) \
(WNCK_MAJOR_VERSION > (major) || \
(WNCK_MAJOR_VERSION == (major) && WNCK_MINOR_VERSION > (minor)) || \
(WNCK_MAJOR_VERSION == (major) && WNCK_MINOR_VERSION == (minor) && WNCK_MICRO_VERSION >= (micro)))
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