Repositories software

Hello,

(I'm French)

NetBSD 5.1 (32, 64) are installed on two computers, without desktop environment.
I wish create a file who contains the links for easy install without use allways "export PKGPATH" :

pkgadd gnome

pkgadd firefox

etc.

I've read documentation about rc.conf, but I've not found any information for this.
Please, if you know that, give me links or informations.
Thanks.
Greetings