/usr/lib/x86_64-linux-gnu/perl5/ is in libgtk2-gladexml-perl 1.007-2+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/5.20/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/Gtk2/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/Gtk2/GladeXML/
/usr/lib/x86_64-linux-gnu/perl5/5.20/auto/Gtk2/GladeXML/GladeXML.so
/usr/lib/x86_64-linux-gnu/perl5/5.20/Gtk2/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Gtk2/GladeXML.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Gtk2/GladeXML/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Gtk2/GladeXML/Install/
/usr/lib/x86_64-linux-gnu/perl5/5.20/Gtk2/GladeXML/Install/Files.pm
/usr/lib/x86_64-linux-gnu/perl5/5.20/Gtk2/GladeXML/Install/gladexmlperl.h
/usr/lib/x86_64-linux-gnu/perl5/5.20/Gtk2/GladeXML/Install/gladexmlperl.typemap