cygwin /py-punct.el/ build problem

[djh]

- cygwin version: CYGWIN_NT-5.1 1.5.22(0.156/4/2) 2006-11-13
- emacs cvs version: 2006-11-28 
- gcc (GCC) 4.2.0 20061107
- compiled emac.exe give to $../src/emacs --version ==>   "GNU Emacs 22.0.91.1"

The following error occurs during make bootfast
-----------------------------------------------

make[3]: Entering directory `/cygdrive/c/emacs/cvs/emacs/leim'

EMACSLOADPATH=/cygdrive/c/emacs/cvs/emacs/leim/../lisp LC_ALL=C ../src/emacs 
-batch --no-init-file --no-site-file --multibyte -f batch-byte-compile 
/cygdrive/c/emacs/cvs/emacs/leim/quail/py-punct.el

Fatal error (6)make[3]: *** 
[/cygdrive/c/emacs/cvs/emacs/leim/quail/py-punct.elc] Aborted (core dumped)

-----------------------------------------------

By running the above command line by hand and experimenting with it I find that 
it will byte compile succesfully if I take out the
delete altogether the LC_ALL assignment below
   LC_ALL=C     

or change it from =C   to =EN as below
   LC_ALL=EN


Any ideas about why this might be?

Regards,
 Darel Henman