problem with sed command and csh

[Olivier Regnier]

Hi everybody,

Actually, i'm working on FreeBSD 6.2 and csh shell. With a sh script, i 
trying to execute this command :
sed -e "s/MAKE_ARGS\([^{]*\){/MAKE_ARGS\1{\n\t'mail/nbsmtp' => 
'WITH_IPV6=1 WITH_SSL=1',/" > /usr/local/etc/pkgtools.conf

The result is not correct, i have an error :
sed: 1: "s/MAKE_ARGS\([^{]*\){/M . . .": bad flag in subsitute command: 'n'

Can you help me please ?

Thank you in advance.