Log Message:
Update to 6.3, provided by Leonard Schmidt in PR 32510.
Add perl to TOOLS, since configure stops if it's not found.

6.3  Wed Jan  4 22:37:10 CET 2006
- SECURITY FIX: on systems using openpty, permissions were
  not correctly updated on the tty device and were left as
  world-readable and world-writable (likely in original rxvt,
  too), and were not restored properly. Affected are only
  systems where non-unix ptys were used (such as most BSDs, not
  GNU/Linux). (found, patched and debugged by Ryan Beasley).
- meta8 support was forcefully enabled in most configurations.
  restored configurability of this (useless) feature (reported
  by Mikachu).
- optionally embed a perl interpreter, which can be used for more
  intelligent/customized selection support, visual feedback,
  menus, tabs etc. See the the urxvtperl manpage, the -pe option,
  perl*-resources and keysym resources. Not everything is there yet.
- try to be more clever about differing font sizes and their ascent.
  Not guarenteed to work, but works better in most cases now.
- fix directory permissions on install.
- implemented option to disable built-in line drawing characters
  and fall back to the font ones (patch by Martin Pohlack).
- disabled sched_yield support: the linux version is just too useless
  (it schedules nice'd processes before the own one for extended
  periods). Too bad, it could reduce system time by a factor of 5 here.

6.2  Mon Jan  2 16:03:01 CET 2006
- implemented intensityStyles option which enables/disables bold/blink
  selecting high intensity foreground/background colours, suggested by
  Chuck Blake.
- move iso14755 character feedback box out of the way if it would
  obscure the mouse cursor position.
- replaced callback.h by a fixed version from gvpe that correctly
  returns the callback result (affects new -pty-fd semantics in urxvtc
  on a few architectures). Reported by darix.
- include one trailing space in rectangular selections to indicate
  the inserted newline (yeah, weird, but visually more pleasing).
- try to use sched_yield to (drastically) improve terminal data
  transfer efficiency.
- further minor cleanups.

6.1  Tue Dec 27 13:23:40 CET 2005
- update iso8859-7 table (euro and drachma round-trip et al.).
- fix a crash when the selection scrolls out of the scrollback
  while the user still drags.
- selections that were partially scrolled out of the window were
  not drawn correctly.
- lines newly scrolled in were not initialized properly, leading
  to extremely long lines and (hopefully) some segfaults.
- iso14755 overlay position was wrong.
- iso14755 overlay now displays rendition info, too.
- use unicode white space class instead of hardcoded values for
  stripping whitespace.
- do whitespace stripping on rectangular selections.
- slight cleanups in src/features.h.

6.0  Sat Dec 24 13:58:56 CET 2005
- make it compile without SMART_RESIZE again.
- enable slow link support by default.
- fix relative cursor-positioning not respecting scrolling regions
  (also a bug in original rxvt).
- initialize termios structure to zero when fetching it fails
  (see http://www.freebsd.org/cgi/query-pr.cgi?pr=84647 for a
  partial patch).
- bump max columns/rows to 10000 each.
- bump max savelines to 10000000.
- -pty-fd now passes the urxvtc fd to the urxvtd process.
- avoid linking against -lnsl/-lsocket/-lxpg4 unless neccessary.
- major code cleanup (still not complete, though).
- implement -hold option.
- _major_ rewrite of internal buffer handling:
- re-flow on resize, lines get wrapped instead of winged.
- circular line buffer (substantially speeds up scrolling).
- slightly less code + data memory usage per terminal.
- slight overall speed improvements.
- considerably improved code clarity.
- partial-screen scrolls no longer end up in the scrollback
  buffer.

5.9  Sat Dec 17 21:53:17 CET 2005
- fix a bug in the menu code of unknown impact, found by darix.
- clean up signal handling to be global, not per terminal
  (matters only for rxvtd).
- fix small typoe in rxvt.1 (found by Mike Fabian).
- don't crash when broken xft/fontconfig/freetype versions return
  bogus data, ignore the xft font instead (experienced on suse).