Autoconf, config.in and configure in fileutils 4.1

Hi,
 
I modified the source (just a path) of fileutils 4.1 and now
I want to compile.
 
So I execute:
 
aclocal -I m4
autoconf
autoheader
automake -a -c

And when I want to execute ./configure I got this output:
 
$ ./configure
./configure: line 10: syntax error near unexpected token `;'
./configure: line 10: `' ECHO_T=' ' ;;'
 
I'm using automake 1.6.2 and autoconf 2.53

I don't know why autoconf put this line in my configure script.

Anyone can help me ?

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