/usr/lib/x86_64-linux-gnu/urxvt/ is in rxvt-unicode 9.22-3.
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/usr/lib/x86_64-linux-gnu/urxvt/perl/
/usr/lib/x86_64-linux-gnu/urxvt/perl/background
/usr/lib/x86_64-linux-gnu/urxvt/perl/bell-command
/usr/lib/x86_64-linux-gnu/urxvt/perl/block-graphics-to-ascii
/usr/lib/x86_64-linux-gnu/urxvt/perl/clipboard-osc
/usr/lib/x86_64-linux-gnu/urxvt/perl/confirm-paste
/usr/lib/x86_64-linux-gnu/urxvt/perl/digital-clock
/usr/lib/x86_64-linux-gnu/urxvt/perl/eval
/usr/lib/x86_64-linux-gnu/urxvt/perl/example-refresh-hooks
/usr/lib/x86_64-linux-gnu/urxvt/perl/font-size
/usr/lib/x86_64-linux-gnu/urxvt/perl/keysym-list
/usr/lib/x86_64-linux-gnu/urxvt/perl/kuake
/usr/lib/x86_64-linux-gnu/urxvt/perl/matcher
/usr/lib/x86_64-linux-gnu/urxvt/perl/option-popup
/usr/lib/x86_64-linux-gnu/urxvt/perl/overlay-osc
/usr/lib/x86_64-linux-gnu/urxvt/perl/readline
/usr/lib/x86_64-linux-gnu/urxvt/perl/remote-clipboard
/usr/lib/x86_64-linux-gnu/urxvt/perl/searchable-scrollback
/usr/lib/x86_64-linux-gnu/urxvt/perl/selection
/usr/lib/x86_64-linux-gnu/urxvt/perl/selection-autotransform
/usr/lib/x86_64-linux-gnu/urxvt/perl/selection-pastebin
/usr/lib/x86_64-linux-gnu/urxvt/perl/selection-popup
/usr/lib/x86_64-linux-gnu/urxvt/perl/selection-to-clipboard
/usr/lib/x86_64-linux-gnu/urxvt/perl/tabbed
/usr/lib/x86_64-linux-gnu/urxvt/perl/urxvt-popup
/usr/lib/x86_64-linux-gnu/urxvt/perl/xim-onthespot
/usr/lib/x86_64-linux-gnu/urxvt/urxvt.pm