latest auctex CVS fails to load under xemacs 21.5.19

Visiting a tex file in the latest CVS auctex under xemacs 21.5.19 
(CVS-20050227) fails to load auctex, and produces the following backtrace:

(1) (file-mode-spec/warning) Error in File mode specification: Wrong 
type argument: stringp, 12

Backtrace follows:

   string-match("^[0-9]+" 12)
   # bind (base-size-string face-name num --dotimes-temp--50522 i)
   font-latex-make-title-faces()
   byte-code("..." [font-latex-make-title-faces custom-declare-face 
font-latex-title-4-face featurep xemacs ((((type tty pc) (class color) 
(background light)) (:foreground "blue4" :bold t)) (((type tty pc) 
(class color) (background dark)) (:foreground "yellow" :bold t)) 
(((class color) (background light)) (:bold t :foreground "blue4" :family 
"helvetica")) (((class color) (background dark)) (:bold t :foreground 
"yellow" :family "helvetica")) (t (:bold t :family "helvetica"))) 
((((type tty pc) (class color) (background light)) (:foreground "blue4" 
:weight bold)) (((type tty pc) (class color) (background dark)) 
(:foreground "yellow" :weight bold)) (((class color) (background light)) 
(:weight bold :inherit variable-pitch :foreground "blue4")) (((class 
color) (background dark)) (:weight bold :inherit variable-pitch 
:foreground "yellow")) (t (:weight bold :inherit variable-pitch))) "Face 
for LaTeX titles at level 4." :group font-latex-highlighting-faces] 6)
   # (unwind-protect ...)
   # (unwind-protect ...)
   # (unwind-protect ...)
   # (unwind-protect ...)
   # (unwind-protect ...)
   # (unwind-protect ...)
   # (unwind-protect ...)
   # (unwind-protect ...)
   load-internal("font-latex" nil nil nil binary)
   # bind (path handler filename nosuffix nomessage noerror file)
   load("font-latex" nil nil nil)
   # (unwind-protect ...)
   font-latex-setup()
   VirTeX-common-initialization()
   LaTeX-common-initialization()
   latex-mode()
   tex-mode()
   # bind (alist mode name keep-going)
   # (unwind-protect ...)
   # bind (just-from-file-name)
   set-auto-mode()
   #<compiled-function nil "...(5)" [set-auto-mode t] 1>()
   # (unwind-protect ...)
   call-with-condition-handler(#<compiled-function 
(__call_trapping_errors_arg__) "...(17)" [__call_trapping_errors_arg__ 
errstr error-message-string lwarn file-mode-spec warning "Error in %s: 
%s\n\nBacktrace follows:\n\n%s" "File mode specification" 
backtrace-in-condition-handler-eliminating-handler] 8> 
#<compiled-function nil "...(5)" [set-auto-mode t] 1>)
   # (condition-case ... . ((error)))
   # bind (find-file)
   normal-mode(t)
   # bind (nomodes after-find-file-from-revert-buffer noauto warn error)
   after-find-file(nil t)
   # (unwind-protect ...)
   # bind (inhibit-read-only error number truename rawfile nowarn 
filename buf)
   find-file-noselect-1(#<buffer "chap3.tex"> 
"/Backup/Documents/Coursework/Mecanica Teorica/Apuntes/chap3.tex" nil 
nil "/Backup/Documents/Coursework/Mecanica Teorica/Apuntes/chap3.tex" 
(631381 234881026))
   byte-code("..." [number truename rawfile nowarn filename buf 
set-buffer-major-mode find-file-noselect-1] 7)
   # (condition-case ... . ((t (byte-code "¬!à√	@	A\"á" [buf data 
kill-buffer signal] 3))))
   # bind (number truename buf wildcards rawfile nowarn filename)
   find-file-noselect("/Backup/Documents/Coursework/Mecanica 
Teorica/Apuntes/chap3.tex" nil nil nil)
   # bind (wildcards codesys filename)
   find-file("/Backup/Documents/Coursework/Mecanica 
Teorica/Apuntes/chap3.tex")
   eval((find-file "/Backup/Documents/Coursework/Mecanica 
Teorica/Apuntes/chap3.tex"))
   # (condition-case ... . error)
   # (catch top-level ...)

My installation info follows:

uname -a: Darwin imac-g5.local 7.8.0 Darwin Kernel Version 7.8.0: Wed 
Dec 22 14:26:17 PST 2004; root:xnu/xnu-517.11.1.obj~1/RELEASE_PPC  Power 
Macintosh powerpc

./configure  '--pdump' '--error-checking=no' '--with-ldap=no' 
'--with-postgresql=no' '--with-default-eol-detection' '--with-mule=no' 
'--with-tty' '--with-athena=3d' '--with-widgets=motif' 
'--prefix=/opt/local' '--infodir=/opt/local/share/info' 
'--mandir=/opt/local/share/man' '--cflags=-fast' 
'--site-includes=/opt/local/include' '--site-libraries=/opt/local/lib' 
'--dynamic'


XEmacs 21.5-b19 "chives" (+CVS-20050227) configured for 
`powerpc-apple-darwin7.8.0'.


Compilation Environment and Installation Defaults:
   Source code location: 
/Users/artemio/Archive/xemacs/xemacs-21.5
   Installation prefix:               /opt/local
   Additional header files:           /opt/local/include
   Additional libraries:              /opt/local/lib
   Operating system description file: `s/darwin.h'
   Machine description file:          `m/powerpc.h'
   Compiler version:                  gcc (GCC) 3.3 20030304 (Apple 
Computer, Inc. build 1671)
     - GCC specs file:                /usr/libexec/gcc/darwin/ppc/3.3/specs
     - Compiler command:              gcc -Wall -Wno-switch -Wundef 
-Wsign-compare -Wno-char-subscripts -Wpacked -Wpointer-arith 
-Wunused-parameter -g  -fast
   libc version:
   Relocating allocator for buffers:  no
   GNU version of malloc:             no
     - The GNU allocators don't work with this system configuration.

Window System:
   Compiling in support for the X window system:
     - X Windows headers location:                 /usr/X11R6/include
     - X Windows libraries location:               /usr/X11R6/lib
     - Handling WM_COMMAND properly.
   Using Lucid menubars.
   Using Lucid scrollbars.
   Using Motif dialog boxes.
   Using Motif native widgets.

TTY:
   Compiling in support for ncurses.

Images:
   Compiling in support for GIF  images (builtin).
   Compiling in support for XPM  images.
   Compiling in support for PNG  images.
   Compiling in support for JPEG images.
   Compiling in support for TIFF images.

Sound:

Databases:
   Compiling in support for Berkeley database.
   Compiling in support for DBM.

Internationalization:

Mail:
   Compiling in support for "file" mail spool file locking method.

Other Features:
   Inhibiting IPv6 canonicalization at startup.
   Compiling in support for dynamic shared object modules.
   Using the new portable dumper.
   Compiling in support for extra debugging code.

Any hints?

Cheers,

Artemio Gonzalez
artemiog<AT>mac<dot>com

begin:vcard
fn:Artemio Gonzalez
n:Gonzalez;Artemio
email;internet:[email protected]
version:2.1
end:vcard