Pseudoterminals increase: compilation error

[Unga]

Hi all
 
I'm using FreeBSD 7.0.

As per FAQ,
http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/admin.html,
I tried to increase the number of ptys:
 "10.19.1
 Build and install a new kernel with the line in the
 configuration file:
 device pty N
 where N is the number of requested pseudoterminals."
 
I tried to recompile the kernel.  I have modified the
GENERIC as follows:
device          pty  64          # Pseudo-ttys (telnet etc)
 
This results a compilation error:
config: /usr/src/sys/i386/conf/GENERIC:268: syntax error
*** Error code 1
 
Kind Regards
Unga