I am hoping to get isdn4bsd working on 2 NetBSD 1.5.1 boxes. However, as I
see it, it was only integrated into 1.5Q, and I can find no reference to it
in the src or pkgsrc on my box. Do I need to install a later version to
start messing around, or can I somehow patch my boxes?

Any help or pointers would be much appreciated.

Thanks
 Stuart