/lib/cpp not found in c-mode

[Stefan Monnier]

I just got the following backtrace.  Any idea what's up?
I indeed don't have /lib/cpp (this is on MacOSX) but it shouldn't prevent me
from opening a C file,


        Stefan


Debugger entered--Lisp error: (file-error "Searching for program" "no such file 
or directory" "/lib/cpp")
  call-process("/lib/cpp" "/Users/monnier/src/emacs/work/src/xterm.c" t nil 
"-dM")
  cc-create-define-alist()
  c-mode()
  set-auto-mode-0(c-mode nil)
  set-auto-mode()
  normal-mode(t)
  after-find-file(nil t)
  find-file-noselect-1(#<buffer xterm.c> "~/src/emacs/work/src/xterm.c" nil nil 
"~/src/emacs/work/src/xterm.c" (5067662 234881033))
  find-file-noselect("xterm.c")
  gdb-info-breakpoints-custom()
  gdb-info-breakpoints-handler()
  gdb-prompt("")
  gud-gdba-marker-filter("\npre-prompt\n(gdb) \nprompt\n")
  apply(gud-gdba-marker-filter "\npre-prompt\n(gdb) \nprompt\n")
  gud-marker-filter("\npre-prompt\n(gdb) \nprompt\n")
  gud-filter(#<process gud-emacs> "\npre-prompt\n(gdb) \nprompt\n")