Can you run the reconfiguration manually please as share\lyx\configure --keep-temps and then have a look at the generated chkconfig.sed file.
I've had to edit the batch file configure.bat and add the switch "--keep-temps" to get it to work.
Here, the first line of the file is: [EMAIL [EMAIL PROTECTED] 7, 2003!g
Perhaps your version of sed is choking on the '!' delimiters? Change this line to: s/@chk_date@/August 7, 2003/g and see if you get to line 2.
No, still fails on line 1 with the same message
s/@chk_date@/November 20, 2003/g ...snip...
\share\lyx>sed -f chkconfig.sed sed: file chkconfig.sed line 1: Unknown option to 's'
Regards,
Milos